This specific conflict is more related to early 20th Century Britain promising two different people the same land after the Ottoman Empire collapsed and then being dicks about it for another 20 years. So UK imperialism, not US for once.
The US certainly still arms Israel, but the US arms basically anyone they consider an ally. The US would arm Israel if Palestine were its own state, were part of Israel, or if the whole conflict never happened. But Israel wouldn't have existed at all past '67 without Western equipment.
Ignoring nuance is claiming only one side is right. It's easy and borderline brainless to simply claim Israel is the only side wrong for bombing hospitals.
But this ignores that Hamas is committing war crimes by using civilian facilities as staging grounds to launch attacks on Israel. This ignores that Hamas' charter calls for the destruction of Israel, and the only thing stopping them is lack of weapons. This ignores that Hamas, the democratically elected ruling party of Gaza, has continued to use resources to attack Israel instead of building infrastructure to actually function independently.
Ignoring nuance is to ignore history. Ignoring that the West created this whole situation, by both promising one region to two peoples then creating division where there was none to make colonial rule easier, and by also so brutally attempting to wipe out an entire people it created a hardline cultural belief that swift and severe military action is necessary to insure "never again," (and two wars in '48 and '67 didn't help either).
None of this is to say Israel is innocent of wrongdoing - they sure as shit aren't and certainly seem happy to bomb 100 Palestinian civilians if it means they get 1 Hamas fighter. But rejecting nuance pushes a belief one side is right and one side is wrong, and that the only sides here are national ones. Both suck, both are morally wrong. The only "right side" is Palestinian and Israeli civilians being killed because the only "wrong side" - extremist Israeli and Palestinian leaders - are happy to kill as many civilians as possible for some acres of land.
But please, do tell me how my opinion is wrong and there's no complexity here.