"I take issue with that the land provided for this project was taken without the consent of any of the nations from which it was taken, which is colonialism and why it's impossible to separate Israel from the colonialist roots that helped create it"
Who was the land taken from? It was owned by the British from WWI to '48. Before that, it was owned by the Ottoman empire, before that it was an Egyptian kingdom and going further back it was the Roman empire. And at some point before that, it was Judea which was the land of the Jews. The Romans renamed Judea to "Palestine" to remove the connection of Jews to that land.
"Like, there's no reason at all (apart from latent, extremely quiet antisemitism on the part of the Allied powers post WWII that they didn't want to discuss) that all those refugees couldn't have been subsumed into any of these countries, especially America, who at the time was boasting not only the only economy not obliterated by WWII, but also shit tons of open land."
Israel was pretty empty too in 1948. There was enough room for the European refugees and the Palestinians. The 1948 partition was not the best for everyone, but it did give both Jews and Palestinians a new homeland, something neither had post Judea or anytime for the Palestinians.
A big reason for wanting their own land, was to provide a safe haven. Jews were doing very well in pre-Nazi Germany, and that changed quickly. The same could happen in the US too. There's historically been very few safe havens for Jews in Europe (And America is pretty much an extension of Europe).
I don't agree with your premise about colonialism or that Israel was created to be a bridgehead for western powers. But I do appreciate your writing and dialog on the matter.