That's not a historically or spatially universal "best"; it's not optimal. It's "the best we can do given the historical and geopolitical contingencies as they actually are right now." I don't think you even need transhumans or something to have non-ethnic states actually work, you just need to break out of the "Jihad vs McWorld" paradigm of geopolitics.
(Speaking of silly leftists, the man who wrote Jihad vs McWorld concentrated most of his ire on McWorld, since he was writing in the '90s and did not think jihad would become a severe problem. I think we can both say, on this one: what an idiot!
But the bigger question is: if he implicitly supported racial and religious chauvinist movements against capitalist globalization, does that make him, and by implication the entire left-wing "antiglobalization" movement of the '90s and 2000s, reactionary, or some other form of right-wing?
I would say, yes, at least in effect, in the same sense that "pacifism is objectively pro-fascist". You?)
What historical and geopolitical contingencies would allow for the development of a better pragmatic form of government than ethnostates?
Through LessWrong, I've discovered the no-reactionary movement. Servery says that there are some of you here.
I'm curious, what lead you to accept the basic premises of the movement? What is the story of your personal "conversion"? Was there some particular insight or information that was important in convincing you? Was it something that just "clicked" for you or that you had always felt in a vague way? Were any of you "raised in it"?
Feel free to forward my questions to others or direct me towards a better forum for asking this.
I hope that this is in no way demeaning or insulting. I'm genuinely curious and my questioning is value free. If you point me towards compelling evidence of the neo-reactionary premise, I'll update on it.