But the status and privileges afforded many black "leaders" (Jackass, Dullton, et al) are tied to keeping slavery outrage whipped up. Even here in Idaho, where relations between all races are better than anywhere else in the nation that I've seen, the black leaders used the King observance to decry treatment of minorities. Their power and prestige is tied to continued racial unrest.
Scouts Out! Cavalry Ho!
As far as that goes, I don't imagine that there any Jews left alive (or Romans either for that matter) who had a hand in the crucifixion.