Agreed, but realistically: for the near future there will be no legislative restriction in the US on harmful content. Congress is far too grid-locked for that, not to mention the question if meaningfully combatting hate speech and bullying can actually be done via laws or requires constitutional amendments - which are even more unrealistic.
Meanwhile, sites like KF (or rather: their users) will cause a lot of harm, including cyber-bullying people to suicide. At what point will you draw the line? Or clearer: how many dead people will it require?
The whole insistence on "we need a legislative solution" reminds me way too much of European inner politics on refugees: politicians all over the EU said "we won't deal with refugees on our own, we want an European solution" - all while knowing that thanks to the destructive-obstructionist Polish and Hungarian governments there was no chance of such an "European solution", and as a result nothing changed - and thousands paid with their life [1] as a result as they drowned in the Middle Sea.
In the end it's always the same: placing abstract morals over clear and provable actual harm to people's health and sometimes life.
[1] https://de.statista.com/statistik/daten/studie/892249/umfrag...