If you say that Israel handing over Gaza to the PA and withdrawal from the Gaza strip ended up being a big mistake I can agree with that in retrospect. At the time I personally thought there's a chance for peace. But that sort of brings us way back to the question of how is this conflict going to be resolved when all paths lead to bad outcomes.
Hamas was a death cult way before 2017.
The relationship between Palestinians in Gaza and Hamas is also more complicated then "victimized". I mean you're right but there are nuances there.
Hamas isn't oppressing people in the west bank. What explains the polls showing strong support for Hamas there?
EDIT: another random btw, I think your comments regarding the conflict are generally well informed and with good intentions. I appreciate that. It's sorely missing from online conduct on this topic.