There is always 'censorship' in operation. Either overtly when things are not allowed or covertly where some things are simply not aired, people not given visas, opportunities, blacklisted and generally isolated. The problem is when people take an absolute and utopian position pretending these are actually not in effect when they always have.

Perfect examples are hate speech and incitement to violence and even things like nudity and pornography. Most countries have laws against this. For instance most islamic extremism videos and content are already banned and taken down rapidly, preachers and other known purveyors of hate are not given visas and are not allowed to air their views. That's clear cut and no one has a problem with it.

Since most ideologies and religions have an extreme element they will propagate extreme views and incite hate, and the question then becomes if you are comfortable having social media full of people openly spreading hate against religions, race, sex or any other subgroup.

And its here we must explicitly beware of double standards and some people supporting some kinds of extremism opportunistically and muddying the waters under the pretext of free speech because it doesn't threaten them personally.