Their minds are infected with the Jewish idea (pathological, narcissistic delusion), that they're the special chosen ones of god. Their souls are ontologically, essentially superior to the souls of non-Jews ("goyim"), so this is why they feel entitled to do whatever they want against non-Jews. So-called "Amalek", is a symbolic name for the non-Jewish enemies of Israel, that have to be eradicated. They believe they're going to enslave the whole world, under their Jewish messiah-king in the future. This is Jewish thought and culture, their religion.
Even secular Jews who aren't religious are negatively influenced by these crazy Jewish myths.
They're in a vicious cycle of perpetual victimhood justifying their bad behavior based upon past events in Jewish history. They keep stacking up the antisemitism, making excuses for their bad behavior, blaming everyone else for their misery.
They feel they have a license to do whatever they want against Palestinians, because of their special, superhuman, "divinely chosen" position. They're contaminated with Jewish-supremacist ideas, that encourage them to behave like little monsters. I don't want my tax dollars funding their Jewish ethnostate.