To which I can only add that he is a also a Jew-hating Jew.
Whenever people ask me how Jews can still vote left, I always have the same answer: their religion is not Judaism, it's leftism. These non-Jewish Jews (or Jew-hating Jews) have no allegiance to the G-d of Israel. They are only loyal to political leftism.
Their "church"/synagogue is Political Leftism.
That's the explanation.
If you look at them with this explanation in mind, you won't ever be puzzled by them again. Yes, you can still be infuriated, but not puzzled.
Unfortunately, Jews have a long history of naive utopianism and for clinging to false messiahs.