Do you really think the entire western world is pissing off their citizens for fun? You really don't understand geopolitics at all. The support for Israel isn't just for shits and giggles, governments are sending them billions and have very good hidden reasons(military). The primary rule of Proxy wars is "don't talk about proxy wars" which is why the public is so mad, and the governments are going to keep supporting them anyways.
Iran has done an excellent job of sacrificing Palestinian lives to turn the PR against Israel. You think Israel want's to be killing civilians? They actually don't, it's bad for their image. Unfortunately Hamas literally sets up bases in schools, hospitals, and other civilian areas because they're literally using human shields and you're acting like Israel is just supposed to ignore them? This is how urban guerrilla warfare works. It's dirty as fuck, and there's no better options.
The only thing stopping other countries from holding Israel accountable... Yea, NO SHIT. The US is THE military superpower for the western world and they aren't willing to give up that strategic location. It's not just the US though, everyone from the UK to Canada is saying "please stop" while still sending financial support. It's a PR issue at this point for governments, but they'll keep working on the problem and keep sending money.
You act like the US has other weapons that can ignore distance but you can't just shoot everything from the other side of the globe, it's far too expensive to hit more than a handful of targets that way.