I think that Palestinian terror is viewed with tolerance by liberal elites and considered to be morally ambivalent by Hollywood because it is a Third World movement by "oppressed minorities."
It is controversial in Hollywood to portray "oppressed minorities" as evil - take for example The Sum Of All Fears in which the enemy is deArabized into acceptably demonizable Russian neo-Nazis. Or in Kingdom of Heaven when the enemy is really evil Europeans, etc., etc.
It's the same mentality that dribbles into real life, as when clues to the true identity of the DC snipers went unpublicized and the search was on for a disgruntled white conservative.
The phenomenon of self-hatred is alive and well in Hollywood.