Biden is older than Israel, he was 6 when it was created, and he has said he will always support them no matter what because when he was a child his father made him promise to.

Elderly people often don't realize how much has changed. In Biden's eyes Israel will always be the victims because of WW2.

For him to accept that was generations ago and lots has changed, he'd have to come to terms with how old he is.

And if he could do that, he wouldn't be trying to increase his record for oldest president ever.

Why? Well the TL;DR is that it's very fucking complicated.

Israel is a useful military proxy for the US. They probably do a lot of advantageous things for us. (the US isn't just the tooth fairy after all) i've heard on the grape vine that we have existing established weapons deals with israel that could very iffy to overturn (as per usual with this shit)

zionist as a term is also very broad. It can be used to mean quite a lot, though specifically with islam, it seems to be a pretty generic term of "we want our own state" and that's about it.

hamas is funded/supplied by iran (unless this has changed?), last i checked we bombed the ever living shit out of iran in the war on terror, so they probably don't like us, and we probably don't like them, so as far as the US is concerned, this is just a proxy war on iran with israel buying our military equipment. We've seen iran strike israel, and israel strike iran, so this is basically just a proxy war at this point.

strategically, from a military perspective, there is probably a "good" reason to be doing this, good as in the sense of keeping your military power healthy. This is technically a way of the US testing equipment in war time, though who knows how much of that is true. military hardware investigation is a fucking nightmare so i might just be pulling that one out of my ass honestly. There are almost certainly other benefits, like the aforementioned proxy war, it allows us to keep an eye on how war tends to work in the middle east, which gives us a technological leg up, because we can prepare for that.

the israel/palestine conflict itself goes back quite far, and continues into even murkier waters. If you look into some of the history it's pretty fucked up. And incredibly hodge podge. This shit has never been clean, will never be clean, and can never be clean. This is just an unfortunate fact of long term disputes.

israel has kind of pushed palestine into a hard space over the years. Palestine has reacted by creating a hard space to push israel into, which israel is obviously pushing back on. And now we have warfare in an urban setting.

This shit sucks, it's awful, there's almost no way to have a set opinion on anything except for the fact that "it's bad"

oh and need i mention we're in between what is essentially two marginally different accounts of history through religion? To my knowledge, israel, and palestine refer to the same plot of land (at least roughly) in a historical sense (religious texts lmao, but probably even outside of them) so now we have two parties, who are basically the same party, fighting over what is basically the name of a place, but actually because israel decided they don't like palestine? (probably, i dont know why they did this shit, could be a multitude of reasons) now it's essentially escalated into what can only be described as a war.

now to be clear here, i'm not supporting any one party here. I'm just pointing out a handful of complex reasons as to why this might be the case. I hate when people take incredibly complex geopolitical conflicts and rivalries and go "well actually bad dumb and good smart"