I think PC is more a shield for individuals who wish to avoid discussing ugly truths. It's true that religious leaders sometimes appeal to PC sentiments in order to avoid addressing legitimate criticisms, but I don't think it's all that common.
I also don't think that all cries of "bigotry!" are illegitimate -- for instance, anti-Muslim bigotry in America is a very real thing.
I also don't think that all cries of "bigotry!" are illegitimate -- for instance, anti-Muslim bigotry in America is a very real thing.