Turkish nationalism, of the genocidal ethnocentric variant, was a direct result of what Turkish leaders at the time personally experienced in the Balkans. The lesson learned was 100s of years of residence in a land didn't entitle you to anything. Just as Turkish reformists copied European concepts in warfare, education, parliamentary reform, they also copied population removal policies.
My only regret today is my ancestors didn't finish the job of population removal when they had the shot. Turkey would be that much closer to Caspian Sea access today.