Ian, this is such a challenging situation. People like Quinn Norton argue for engagement, while others argue that bigotry should be banned. I think that my initial response is to ban the liars and bigots, but the conundrum that was pointed out to me recently is that if you deny the voice of a particular few they will most likely find their own space somewhere else.
I found this podcast on ‘free speech’ intriguing:
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It is always more complicated than we want it to be I guess.