My opinion is that freedom of speech is a fine ideal to strive for, but it relies on having a stable society with some minimum level of education (moral and philosophical too, not just the technical kind). It requires people who are able to fully parse the implications of what they are hearing to make sound and rational judgements on the rejection of an idea or the embrace of it. It creates a moral duty for the peopl…
These boards do more than allow this hate to fester. They allow hate to grow as they become a recruiting ground that can radicalize people who never would have fallen into this mindset without these boards. 8chan might be compartmentalized in a way that allows it to become an echo chamber of hate, but it also is highly connect to boards about general topics like video games, TV, and movies. This normalizes the hate and it becomes just another thing to talk about.
I would bet a small minority of people who spew hateful things on 8chan sought the site out because of their own hate. Maybe they went there to talk about the new Call of Duty game. Before too long they are ingrained in the whole Gamergate mindset. Then they eventual start hanging out on /pol and before you know it they are a full fledged white nationalist. (A similar thing has been reported about Youtube's recommendation algorithm [1]) This wouldn't happen if the hateful sections of 8chan were sectioned off into their own site. No one accidentally stumbles upon The Daily Stormer and becomes a white nationalist. Just visiting that site genuinely requires a predilection towards hate and a sympathetic ear to white nationalism.
[1] - https://www.nytimes.com/interactive/2019/06/08/technology/yo...