That something — like the nation-state — is a “relatively recent development” says nothing about it at all, qualitatively or morally. Washing your hands before you slice into someone on an operating table is a relatively recent practice, too. Should we also stop doing that?

I despise this sort of shallow thinking. It’s not really thought at all. It’s confirmation bias combined with shoddy ideation combined with pollyanna-ish wishful thinking.

About the nation-state specifically, I am not certain that it’s the best way to organize a society or a polity either. Perhaps there are better ways and we should almost certainly be looking for those ways. However, I’d never abdicate my responsibility to consider this sort of problem deeply, all just so that I could have some sort of mood affiliation with what makes others feel righteous and equanimous in their vacuous thought bubbles.