Hamas appeared to commit genocide, to destroy Israel and kill the Jews. You should read their founding document. I have. Here’s an atlantic piece that’s a decent critique of it as well:
As for Oslo, Arafat walked away and refused everything, I’m not sure what myths you’ve been reading about it. Palestinians have rejected two-state 5 times, including Abbas in 2008.
At one point Israel agreed to 80% of Palestine mandate to be the Palestinian Arabs and 20% the Palestinian Jews, but in reality they were sure they could just genocide or deport all the jews so even that wasn’t enough.