A common misconception blames Turkish nationalism as the cause of Armenian massacres in Turkey; however, Turkish nationalism did not exist before the 1920s and sometimes Ottoman nationalism is confused with Turkish nationalism. Starting in the 1920s, Turkish nationalism was founded upon the determination of the Turks to survive World War I. The Sevrés Treaty and Sykes-Picot agreements were part of the Entente Powers' & their Anti-Turkish Nationalist allies' plans to divide the crumbling Ottoman Empire.
As a response to Anti-Turkish Nationalism that had begun to ethnically cleanse Anatolia, Turks united behind Mustafa Kemal Ataturk to defend themselves from utter destruction, brought upon various rebellions in the Ottoman lands and the Entente powers marching their armies across Anatolia guided by hundreds of thousands of local non-Muslims sick of Ottoman rule.
When it was Ottoman land, the Entente powers and their local allies fought side by side. After the Bolshevik revolution, Russia had to retreat. After World War I was settled, the British and French retreated knowing they don't want to prolong world war I and broke their promises of rich kingdoms carved from Ottoman land to the local non-Muslims. Ataturk and the Turks of course, had an easier time fighting rebels rather than consistent pressure from European powers.
Is Nationalism rational?
I want to point out, that nationalism is not rational or reasonable. It is by definition, irrational. It is emotion-based, created usually by the rulers to keep solidarity and unity of a nation. Its goal is to unite people for a cause, and it is a motivator. Just like religiosity.
This is very important when understanding human history.
It is plausible and very likely, that Ataturk understood this, so instead of implementing a sense of superiority in Turks over other nationalities, Ataturk promoted inclusiveness and unity. He told people to forget their ethnic groups/religious-identities and previous grievances/hatreds or other revenge-feelings over World War I.
He wanted a clean slate for the Turkish people. He wanted different ethnic and religious groups to unite without bickering with each other. I believe the United States did a great job of this later in the 20th century, but Turkey has always had war and so this was not as easy.
Ottoman Nationalist Armenian Genocide Plans
Ottoman nationalism was an attempt by certain members of the Committee of Union and Progress (Young Turks) to unite the empires’ peoples to fight off the enemies of the empire. The problem was there were too many ethnic and religious groups within the Ottoman Empire that really did not care much about the Ottomans. Why should they care for Ottoman unity? Why would non-Muslims support Ottoman Islamic rule? Sometimes Ottoman Nationalism is confused with Turkish Nationalism and Armenian authors love to reference any hint at Ottoman Nationalism as a motivation or source for "exterminating Armenians."
The issue here is that while the Ottoman Empire is the sick man of Europe trying to save itself from extinction by making attempts at Ottoman-unifying feelings of solidarity, as well as getting the Caliph to issue fatwas against the British in hopes that Arabs will stop rebelling against the Ottomans and unite with Ottoman armies, it was not really interested in suppressing or oppressing anyone.
The Ottomans faced dire extinction. They needed all the help they can get. They had for a time recruited many Christians into the army as conscripts to help fight against the European powers (until they started deserting and taking weapons/ammunition with them). Thus the Ottomans learned a hard lesson in loyalty, and decided that Christians can't always be trusted with weapons.
Everyone acted rationally in that case. The Armenians rebelled, because they were sick of Ottoman rule. They collected weapons, they stole them from the Ottomans, they sabotaged their war effort. It made total sense if you desired to create an Armenian state. They were right to do so.
But the Ottomans were also right to suppress those rebels and not trust the Armenians. They were right to try and keep their empire together (unless you believe empires to be immoral), but they were right in the sense of preserving their empire and their own survival.
CUP Ottoman leadership
The CUP wanted to unite the empire, but they did not intend to rid the Ottoman Empire of its Islamic Empire status. The CUP could not possibly rid the empire of its conservative thinkers or religious people. Instead of replacing Ottoman Islamic rule, Islamic systems and schools, they simply added new European systems alongside the old, because they knew how easily Sultans and Ottoman governments have been overthrown when radical reformers took power.
Sometimes Armenian-Genocide proponents claim that Turkish nationalism, which they claim "Pan-Turkism" or "Turanism" is what fueled and motivated genocide against Armenians. Armenian author Vahakn Dadrian who strongly supports the Armenian Genocide thesis, writes in his book that Talaat Pasha (Minister of Interior) and the CUP met secretly and planned an anti-Foreigner nationalist genocide plan. Dadrian sources British Vice Consul Arthur B. Geary, since he was one of the few diplomats to receive Talaat Pasha's secret speech. However, the source does not mention plans to kill, but merely mentions the difficult "task of Ottomanizing the empire" because without Ottomanization the leaders knew they would soon be victims of revolts such as the problems they witnessed in the Balkans. 
The Ottomans saw how quickly nationalistic feelings spread in the Balkans. The Armenians saw how successful nationalistic rebellion was against the weak Ottoman Empire that is right in the midst of also fighting a World War. Can you imagine a better chance to carve out your own nation?
This isn't to say that Armenians were wrong to do so. No, if they felt oppressed, then they had every right to rebel. But if the Ottomans felt their power threatened then from their perspective they did what was necessary to preserve their empire, and that is to stop rebellions. This was not abnormal or irrational for any empire to do.
Ridding the empire of Christians would have only fueled the Christian Nationalism that was growing in the empire and increase European Powers using imperialism and nationalism to destroy the empire. One has to only read the Tehcir Law (Relocation and Immigration Laws) that relocated Armenians in Eastern Anatolia to understand the intent of the Ottoman government. The Tehcir Law was the most primitive solution of any government to silence future revolutions as a quick and hasty response to Armenian rebellions such as in Van during war-time.
Ziya Gokalp, Turanism
Mr. Dadrian and other pro-Armenian-Genocide authors usually claim that Ziya Gokalp, who had also been a member of the CUP Young Turk government, was responsible for Turanism and thus helped the CUP "set the philosophical base for the eradication of the Armenians" according to Haigazn Kazarian, an Armenian scholar.
The reality is Ziya Gokalp only talked about Turanism in his poem Turan and book The Principles of Turkism, in a very non-political manner. His philosophy according to all interpreters of his work is completely based on Turkish culture and language rather than political unity. Ziya Gokalp talks about Turkish nationalism as a "sharing of education and culture."
Gökalp's theory of nationalism was radically different from other nationalisms at the time. He believed that one became part of the 'Turkish Nation' "through education in its values, not through 'blood' or 'spirit'." His theory was not racialist. In effect, one could say, everyone who wanted to be part of the Turkish nation could do so. It required willpower and education, not having ancestors with the right skin color.
Ziya Gokalp may have influenced the growth of Turkish nationalism in the 1920s but back in 1909 the political atmosphere did not allow a disassociation with Islamic unity. Ziya Gokalp was a humanitarian and his thoughts were mostly poetic and cultural in nature, he did not expect or request anyone to fulfill pan-Turkism. 
Ziya Gokalp’s writings may have influenced certain Ottoman readers, but the exposure was very limited and would have certainly been rejected by Ottoman leaders because of the urgent problems all over the empire that took precedent.
History of Turkish Nationalism
Turkish Nationalism started mainly in the 1920s, beginning with the Turkish War of Independence. The Greek Republic’s invasion in the Western Turkey supported by the British, and the Armenian Republic’s invasion of Eastern Turkey supported by the Russians, the Armenian Legion’s invasion of Southern Turkey supported by the French until the extermination of Turkish civilian population was noticed by the French and the legion disbanded, had all contributed to forced migration of Turks to the center of Anatolia and the development of Turkish Nationalism based on self-defense and fear of extermination.
The destruction of Turks was the worst human tragedy of World War I. A U.S. investigation by Arthur E. Sutherland and Captain Emory H. Niles was recently declassified by the United States National Archives. The report tells a gruesome story that was detailed by Mr. Sutherland and Captain Niles in Eastern Turkish provinces right after World War I in August 1919.
In the report, the Muslim population of Bitlis decreased by 26,000, Van province by 38,000, and in Beyazit by 2,540. The houses of Muslims by 1919, 6,500 houses in Bitlis, 3,397 in Van, and 360 in Beyazit had been burned to the ground. In Van province over 3,000 Turkish/Kurdish villages were destroyed compared to only 99 Armenian villages. Many Armenian population and houses were also destroyed but the destruction of Muslim lives and property was at a much higher percentage. 
Nationalism of Greeks, Armenians, and other Balkan nations were forged out of racial beliefs of ethnic superiority, the illusionary belief that Christians are better rulers than Muslims, and the nationalistic goal of territorial claims. In contrast, Turkish nationalism was formed out of a necessity to survive the attacks and destruction of other nationalists.
This doesn't make nationalism rational in anyway, but nationalism born out of nation-building versus nationalism born out of self-defense, are distinctly different. Though sometimes it's hard to tell the difference.
Turkish War of Independence
The destruction had forced hundreds of thousands of Turkish speakers to migrate to central Turkey and the many other ethnic groups along with them that were thought of as inferior by Greek and Armenian nationalists. This devastation fueled Turkish nationalism and the people's trust of Mustafa Kemal Ataturk grew as the enemy drew closer to central Turkish province of Ankara.
The Turkish Grand National Assembly, which was newly formed in opposition to the Ottoman government in Istanbul that was trying to appease the Allied Powers, had at first tried to restrict the authority of Mustafa Kemal Ataturk. However, as the Greek army had marched from the Western coastal city of Izmir to the province of Ankara where citizens of Ankara city could hear the guns and artillery of the Greek army, the Assembly gave all their authority to Mustafa Kemal Ataturk.
Mustafa Kemal Ataturk organized his armies and slowly drove the Greek invasion back to Izmir. After many battles they finally drove the Greek army to evacuate back to Greece. The Greeks had burned agriculture, livestock, food stockpiles, factories, shops, buildings, and even burned down forests in their deliberate policy to weaken the new Turkish Republic as they retreated back to Greece. They slaughtered thousands of Turkish civilians believing that when they come back there would be less recruits for the Turkish army. When the Turks had arrived, Izmir city was burning to the ground. Although few in number, some Greek nationalists blame Turks for the fire in Izmir, claiming that they were trying to burn the Greeks of Izmir. The idea that Mustafa Kemal Ataturk, who liberated his own industrious port city of Izmir, would for some reason burn his own city, is beyond absurd and such beliefs are irrational nationalistic idealism in which the nationalist is for some reason never at fault. 
The Armenian legion was formed to invade Cilicia (Southern Turkey) with the help of French supplies and officers. However, by December 1921, the Turkish nationalists were able to slowly fend off the Armenian legion and liberate their cities. The French noticing the destruction caused by the Armenian legion on civilian populations decided their interests lay in Syria and not in Cilicia so they made a deal with the Turkish Grant National Assembly in Ankara and withdrew from Cilicia. 
The invasions in the East by the Armenian Republic, which had now ceased to receive aid from Russia due to the Bolshevik Revolution, had caused much destruction of Turks and Kurds in Eastern Turkey. The conflict had created an ethnic communal warfare where both sides were disorganized guerrilla bands seeking revenge for past massacres and wars. Ethnic hatred grew as proper government or civil order disappeared, replaced by massacres, ethnic cleansing, and warfare. The local Armenians banded together with Armenian nationalism that had been born in the 1870s, fueled by the Armenian Revolutionary Federation (Dashnaks) and the Hunchaks who opposed Islamic rule of Christian Armenians. The Armenians remembered the Ottoman Relocation Laws (today Armenians claim it was an Armenian Genocide), and the Turks and Kurds remembered the Armenian betrayal and enforcement of Russia, both of which brought equal death and destruction to the people of Eastern Anatolia. Nevertheless, with the help of Kazim Karabekir Pasha, the Turkish nationalists had finally arrived to easily drive away the disorganized and unaided Armenians. 
Definition of Turkish Nationalism
The problem of Turkish nationalism was that the people of the Turkish nation were of a wide variety of ethnic groups, genes, and races. As such, Turkish nationalism was inclusively defined as either anyone who speaks Turkish or who calls him or herself "a Turk."
Hence, the Turkish nationality has been created from mainly Greek, Armenian, Circassian, Tatar, Laz, Abhazian, Azerbaijanian, Georgian, Assyrian, Jewish, Albanian, Macedonian, Bulgarian Muslim, Sephardic Jew, and Turkish ethnicities and religions. In essence, it is a melting pot of all Anatolian people ranging from the gene pools of Asia and the Balkans. 
Mustafa Kemal Ataturk's speeches clarified that everyone knows the many different ethnicities and religions their ancestors are from, but to create unity and success, people need to put aside their differences and past history as it only fuels hatred and revenge. Mustafa Kemal Ataturk said that no matter what ethnicity or religion as long as you want to be a Turk you are a Turk.
The common traits of the Turkish nation are simply language, culture, tradition, common citizenship and activity, very similar to the make-up of the United States. Unlike European, Arabic, and Balkan nations, there are no exclusive ideas involved in defining a Turkish national. Not having a certain common trait does not exclude one from calling oneself a Turk.
The religious make-up of the majority of Turkey being predominantly Islamic is not a mark that excludes non-Muslims from being Turkish. The religious make-up is an effect of forced migration of Muslims from Europe and the Caucuses into Turkey, and the ethnic cleansing of Jews by Christian nationalists including Jewish migration to Israel, and the internal political problems of Turkey in comparison to more successful and richer European nations in which Christians are attracted and migrate to. Regardless, there are still a considerable number of Christians, Jews, and other religious people in Turkey today. Many Armenians and Greeks in Izmir and Istanbul have remained in those cities for centuries and no one has tried to displace them.
- ^ A Disputed Genocide by Guenter Lewy (2007), p. 45
- ^ The Ottoman Peoples and The End of Empire by Justin McCarthy, p. 75-76 -
- ^ A Disputed Genocide by Guenter Lewy (2007), p. 45-46
- ^ United States National Archives, 184.021/175 and The Ottoman Peoples and The End of Empire by Justin McCarthy, p. 202 -
- ^ The Ottoman Peoples and The End of Empire by Justin McCarthy (2007), p. 145-147
- ^ The Ottoman Peoples and The End of Empire by Justin McCarthy (2007), p. 138-139
- ^ The Ottoman Peoples and The End of Empire by Justin McCarthy (2007), p. 141-144
- ^ The Ottoman Peoples and The End of Empire by Justin McCarthy (2007), p. 200-205