Do you understand the political mess involved in the ties between USA and Israel? There’s multiple factions whose support is conditional on WH supporting Israel. Biden isn’t just negotiating with Netanyahu, he’s negotiating with the rest of his own party and donors. He wouldn’t be able to vote for in UN without consequences, like political factions and donors moving to R instead.

They chose a course of action that allowed the right thing to happen.

As I said above, don’t let the perfect be the enemy of the good.