I think the point was - if the BBC (closely tied with the political establishment) cared so much about children's safety they would have acted against Saville before they were compelled.
What exactly were we talking about again? OP seemed to be saying "cops and the BBC don't care about child abusers, therefore hate speech isn't a real problem," which...seems to be missing several critical links.
I think they're trying to say that "hate speech" was invented by a hypocritical government to control people and it's not a real concern for regular folks, but that's obviously not true; it was born out of civil rights campaigns in the '50s and (eventually) adopted by governments due to popular demand.