Among progressive-left racists there are any number of topics around the long Arab war against the Jews that are entirely verboten. Here is a short list of things that one is not allowed to discuss on places like Daily Kos.
1) The centuries of Jewish dhimmitude under the boot of Islamic imperialism.
2) The recent construction of "Palestinian" identity, its connection to Soviet Communism, and how it is that this is an Arab people with a Roman name that refers to Greeks.
3) Arab and Palestinian Koranically-based genocidal racism as the fundamental source of the conflict.
4) The ways in which contemporary progressive anti-Zionism serves as a cloak for gross anti-Semitism.
5) The Palestinian theft and appropriation of Jewish history.
7) The historical connections between the Nazis, the Muslim Brotherhood, and the Palestinian national movement.
8) The perpetual refusal of the local Arabs to accept a state for themselves in peace next to the Jewish one.
Since these are things which are verboten on the racist progressive-left, I think that these are things very much in need of discussion.
I imagine that you guys could add to this list if you wanted to, so if anyone has any ideas on additions, please let me know.
In the comments, my partners Doodad and oldschooltwentysix have come up with an additional three topics, around the subject of I-P, that tend to be verboten in progressive-left circles.
9) The progressive portrayal of terrorists as those fighting a righteous war of resistance.
10) The Arab-Palestinian indoctrination of children with Jew hate.
Doodad put it somewhat differently, but I think the above represents fair characterization.
11) Human rights violations against women and children in the Muslim Middle East. (oldschooltwentysix)
The reason that these topics are verboten in progressive-left venues is because any discussion of them undermines the "Palestinian narrative" of perpetual victimhood which they are using like a club against the Jewish state in order to delegitimize it in preparation for its eventual dissolution.
And that's precisely why we need to discuss it.