"I love south park for all the reasons already stated. I agree with equal opportunity haters. There is no group, idea, culture, race, religion, creed, sex, color, political topic, candidate, etc that is safe from them."
Ohhhhhhhh yes there is. The Nation of Islam (Farrakhan's group)
There is an urban myth there is an episode where they make fun of the black muslims that was never shown because the Nation of Islam found out about it before it was released and threatened the creators within an inch of their lives. Parker and Stone aren't stupid. They caved.
Its only a rumor, but its plausible.