Society can absolutely decide not every point of view is worth debating.
Society can absolutely decide not every point of view is worth debating.
Bad debate at best gives a platform for truly repugnant points of view, and at worst causes human pain as victims feel their pain dismissed.
Just because someone sincerely believes that others are subhuman doesn't mean the conversation ends immediately. We could try providing evidence and clarifying whether they are dead-centre wrong or just dealing with a technical detail before turning to exclusionary tactics.
I mean, seriously. If the choices are (1) end the conversation, try and get someone to resign and (2) try and convince someone to take a different view through conversation over a few days then (2) is far superior. We have a lot of people working in, eg, law and the upper echelons of business who are fantastic contributors to the general good despite having extremely questionable moral stances.
Holocaust deniers used this very tactic under the banner of "skepticism".
They wrote books, they gave speeches. They participated in "academic debate" as if the authenticity of the holocaust was something to be debated.
And they caused a lot of pain to those that did live through the holocaust -- only to hear from someone making false claims that it did not, in fact, happen.
We should always explain why something is wrong and try to convince to avoid future trouble.
Stallman is not a serial Holocaust denier. He is a software philosopher.
And insofar as he is an agitator, on most of his pet topics time has proven him to be right rather than to be a troll.
We could have decided that three hundred years ago too, in which case the divine right of kings would still be a thing.
EDIT: A lot of people seem to think that the divine right of kings would not have been a thing worth strongly defending back in the early 1700s - and certainly far more than they would have defended the rights of people in the west indies or far east to not be "raped and killed". Do you have any argument to back this up? Would bumping things to five hundred years change that?
If banning discussion of things outside the overton window wouldn't have had results you'd like then, why would it do so now? There might be reasons! But I haven't heard people bringing them up.