[quantumBerry]

If all "legitimate" platforms ban hate speech, then users wanting to engage in hate speech will all go to some platform that radically allows all speech with disproportionately this undesirable speech. They will intermingle disproportionately with those spreading sexual abuse images, drugs, insurgent propaganda and instructional material, and other undesirable material. Facebook likely makes the problem worse by forcing these "hate speech" and "disinformation users" to be completely surrounded by people with repulsive content, instead of having their repulsive content critiqued and shamed by other users.

Having people with bad, hateful ideas out in the open I would argue is preferable to concentrating all these bad thoughts together with people that will reinforce that it is normal.