From an international perspective, and there's a treaty defining them, the borders of Israel include both of those places.
Israel was created by the same group that broke up Germany because it was part of the ottoman empire before that, and the ottoman empire was destroyed as part of the losers of the war.
Again, I'm not saying the Palestinian people don't have a right to complain or even fight back, but if they lose, they lose. It's not their land, they lost the war 75 years ago. Israel has been letting them stay, but if they want to be assholes about it they're going to get evicted.