Maybe so, but it's perfectly ok to be anti-zionist and anti-neocon, and those are just about the same thing. I suppose it's like the n-word. It's ok (to them) to keep blacks on the plantation, to treat them like idiot children, to keep them on welfare, but by God nobody better use THAT WORD.
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Much of liberal Jewish Hollywood (Reiner, Streisand, that ilk) is anti-Zionist. It is Conservative Jews (those here included) who will declare anyone who questions Zionism to be raving anti-semites.