I don't know why the west imposes its historical guilt onto humanity. These are western crimes, and the world should not have to shoulder this burden. The west has systemically persecuted jews for millennia because they partook in the killing of Jesus (See Jewish Deicide). The arabs on the other hand had always given them refuge and safety of passage - be that during the various crusades, or inquisitions. There is no equivalence here.
The bad blood between the two is a post-colonial thing not limited to the Israel issue but also observable elsewhere, like the Indo-Pak issue.
Besides, Israel has objectively wiped almost all of Palestine off the map - that is an observable, objective fact, so your point is a dead end. You should aspire towards justice and truth, lest the same rigid tribalisms you apply onto others are one day used against you.