Why should people practicing depraved, mentally sick, immoral, filthy and disease causing sexual perversion have any right to promote it?
I see no reason.
Should people be able to promote bestiality? Pedophilia? Incest? Please answer, this is not a rhetorical question.
Mind if I jump in?
The answer to your direct question is Yes, if is far less dangerous to our society to allow total free speech.
A 70 plus year experiment which included, among other things, a crackdown on speech by authorities, ended badly, with tens of millions being killed.