I defend even the fascist’s right to to be wrong and to say it, print it and sing it. Even if they tend to be tattooed, ignorant, minority, man-hating feminist sluts who faithfully vote for any democrat not yet imprisoned including Alvin Green and Hillary.
Ultimately the answer is for the public to be willing not to have minds full of fluff. If that attitude is adopted, then you can have advocates for anything and it gets disdained if it’s palpably wrong, argued over if it’s arguable, and added to mainstream beliefs if it is obviously right.
The ridiculous question arises, who are you going to have as guardian of the morals. That person will then be the moral dictator. I’d sooner some credible God take that role, even if we can’t quite see in total agreement on all the details, than have some human power in the shadows do it.