A large fraction of the German population in the 1930s was also in favour of incarcerating people on the basis of their ethnicity, sexual orientation or political opinions. That doesn't mean that giving those people airing time was a good idea. Just because many people support something despicable, it doesn't mean that we should let them spread those ideas. Tolerant societies really ought to raise their immune defences against intolerant ideas if they want to survive.