Why is the existence of other aspirational minorities a problem? Because Zionism set a dangerous precedent? Perhaps. But the world community did accept Zionist aspiration in Palestine with the UN partition. Even had Ben-Gurion et al acted in good faith, the 55% (or was it 62%?) Jewish portion would have constituted a settler-colonial enterprise. If that renders Israel invalid in the eyes of some, so be it. As Walter Laqueur wrote in his History of Zionism, after WWII the [Zionist] Jews believed that even in the event of a Nazi (or other extermationist) victory at least in their own country they would go down fighting, not led off passively like sheep because they were a minority in someone else's land.

I believe, absolutely, that to be the case in modern Israel. So talking about Israelis decamping from the ME to the US isn't realistic.

There has been a lot of talk about fairness in international relations of late, but is it fair that for other aspirational ethnic & national minorities the world suddenly yelled Stop! in the game of demographic musical chairs ... & them with no place to sit?

I dunno.