When I was in school we were taught genocide is a crime against humanity, now the USA and other countries act like Israel has blackmail material on all their leaders. What causes so many countries to be supporting them like this?
Because the entire world watched and stood by mostly silently as the Jewish people were eradicated in Europe and only stepped up when they became personally threatened.
Then they decided to return the Jewish people to their homeland because 1) it wasn’t theirs to give so it was easy and 2) it wasn’t in their land so they didn’t have to host them.
That is of course a vast oversimplification, but the spoils of past policies have come to roost.
Israel is surrounded by enemies and its currently elected leaders, paranoid beyond reason. Most see the Palestinians as largely innocent bystanders in a war between Israel and Hamas, not true targets, so they don’t support the idea of genocide.
But many of us see Netanyahu as someone who will not stop with eradicating Hamas as that was never his goal, and to pretend that all of these accidental strikes are indeed accidental is infuriatingly insulting.
It’s so difficult to thread the needle that both the Jewish people and Palestinians are embattled in a hostile region. There are good and innocent people there.
And those people are losing.
Edit because I stopped before truly answering: The world has been supporting Israel out of guilt after WWII and undoing that framework of support will take time, and of course Israel is trying to keep that support.