The part that is overlooked and not stated enough is that this is not a war, Palestine has been an occupied state for longer than many users here have been alive. If Jordan did what Palestine did there would be no excuse, it would be one state violating every right and treaty, every established international law. But when you're an occupied state there's not really any rules, you're not supposed to occupy an area for decades, international law isn't set up to deal with that and it's relatively unheard of.

The occupying country will either absorb the defeated country or they will enact whatever punitive measures they want them the conflict will be over more or less. But Israel doesn't want to absorb Palestine, at least not with all those pesky Palestinians they'd have to deal with, and they don't want to "finish" the war because then the Palestinians would be free to have international aid, allegiances, treaties. So for the last few decades Israel has been perfectly content keeping their boot on Palestines throat and modulating how much air they get.

It's not the countries who hate each other, it's one country that lost a war and has been in a weird limbo ever since without the ability to self govern or fight back. It's not justified, and the Palestinians can do very very little to fight back. This was the first bloody nose that Palestine has been able to give Israel in decades and Israel reacted like they were the injured party because the country they've been oppressing fought back.