This might sound bad but it really doesn't take too much brainwashing or indoctrination for a relatively normal person to support genocide. Group dynamics can make normal people otherwise capable of empathy go along with absurd evil. Israeli society currently needs its people to be the absolute worst version of themselves to continue existing, it needs everyone to reaffirm each other's ideology of racial supremacy and their views of Palestinians as subhumans.

I don't think Israeli society can be rehabilitated as a whole, but if you were to reintegrate them into a society not currently in a state of genocidal psychosis, they'd probably just be "normal" racist assholes like everywhere else in the West. Some of them would probably be libs, even. To clarify, this is not to absolve anyone of guilt or responsibility, I just think you don't think you have to be brainwashed or a psychopath to commit horrific acts of evil.