Most Jews today are ignorant of issues of Jewish survival and Jewish in name only. Others, whose religion is really leftism, deeply believe in things that are delusional, without any evidence, and are VERY dangerous to Jewish survival. Appeasing Hitler taught them nothing.
Four main examples
1. The leftist Jews blame Israel for the lack of progress with Palestinians, when the evidence is clear that the Palestinians have zero intention of ever making a real peace with Israel. The want the Jews gone. Period. They cannot provide and empirical evidence that Palestinian leadership will ever accept Israel under any conditions and that they do not want Jews dead and Israel gone. note 1
2. Leftist Jews actually believe Obama's diplomatic jihad that he has Israel's back, and that his Iran deal is anything but the genocidal, catastrophic deal we know it to be, and that he is not telling lie after lie about it. They believe Iran can be trusted and they are not serious about wanting to destroy Israel and the USA. note 2
3. The left supports Hillary, despite her decades of real anti Israel work, and her top aid being a Muslim Brotherhood terrorist note 3
4. The left thinks that you can reason and trust Muslims. Explain then why 81% in a recent poll said they support Isis. the other 19%? Shiites who support Iran's mullahs most likely.