Extreme speech fosters more extreme views and welcomes people who would otherwise not feel welcome anywhere else which might bring them back to a more socially

Extreme speech fosters more extreme views and welcomes people who would otherwise not feel welcome anywhere else which might bring them back to a more socially acceptable train of thought. 8chan and the like instead make these people believe that their ideology is normal and that there's a big community of like-minded people out there. It's toxic and intolerable.