It is not clear what you think who should have thought in '48. Are you arguing that there was a better thing to do with all of the European Jews that had been persecuted (to put it mildly) by their neighbours in Europe? I fully agree that England (the leader in creating what we now call Israel) made a hash of it (with full U.S. backing), but from a high-level perspective I don't see a better general solution than creating a homeland in land that was mostly empty (not completely empty), and had no real government at the time. Certainly they could have better handled the existing population, and tried to figure out a future for both groups, but it wasn't an obviously wrong solution, even in retrospect.
And I will also remind you that Israel has been very welcoming to people of the Jewish faith regardless of their racial heritage. See the large number of black/African Jews that have been settled in Israel. So the protection really has been based on faith, not decent.
Please try to look at both sides here. No-one comes out of the current problems in Israel/Palestine looking like the good guy. President Obama was leaning the U.S. towards a better position (physically defending Israel, while starting to castigate it for its mistakes), only to have been reversed by the Trump administration (who is blatantly and blindly on the side of Israel).