What argument? Maybe a nation state created without ethnic cleansing and suppression of remaining minorities.

But not even that really. As I said, I am an anti-nationalist. I wouldn't want to live in newly created ethnic-national states. And be aware that I am talking with the assumption that "I would be a Bosnian Serb", rather than prescribing anything for anyone other than me.

_{*Lunatic*, n.
One whose delusions are out of fashion.}