Okay, so you are talking Israel here.
You're right the Israeli government is committing genocide.
So lets go ahead and condemn it. Hells no, lets send in a peace keeping force that pushes the Israeli army out of Gaza altogether and and sets up a nonfly zone and a neutral zone between Israel and Palestine.
First off, that's something that historically is a very very bad idea. The US has done this before and it ALL went to shit. You need local governments to do this, but they all have their hands in Gaza as well, many are all too happy to see this happening as it strengthens their position, fuck the Palestinians, who gives a shit.
Okay, so you start forcing the local governments to do this peace army thing. How? Its not their issue, you can't force them, or can you? You can bully them into submission, which will turn allies into not so very allies. This will cost you all your goodwill and soft power, but who cares, were doing the right thing (tm) here, right?
Next up, the Israel government will be pissed. Very pissed. They'll throw it on antisemitism. Bullshit, of course, but they've been doing that quite successfully for decades, so no reason to say this won't work this time. You will lose the Jewish vote in the US, you will lose the votes of those that agree with the dumb antisemitism thing.
This is a LOT of lost votes, and elections always being as close as they are, you WILL lose the election. Trump wins, he will send in US troops to help slaughter Palestinians, as he has promised before, and he will help to eradicate them. Will mass murder and genocide be a problem for him? Nah, the Supreme Court already decided the president is immune and pretty much King. Protests in the streets will be answered with mass arrests or hell, why not, even bullets because Trump can do whatever the fuxk he wants.
See a picture forming here?
It. Is. Not. That. Easy.
Sure, I'm just writing down a possible scenario, call it a dumb fantasy if you will, but it makes the point: The US meddling in Middle Eastern affairs has NEVER worked out well for any of the countries there. Also, you start even so much as criticizing Israel and you can lose critical votes, which you -now more than ever- will need to not get your dictator wannabe elected.
All this "Biden likes genocides!" is screaming from 15 year olds that can't see beyond their own nose.