It MAY be a bit over the top, but perhaps if we just dug a deep hole and shoved these people who do this kind of shit into the hole, and then covered it up, the human race would be disproportionately improved.
Do this for all the psychopaths. That we tolerate this in any way is kind of the problem.
PERHAPS being somewhat less extreme, we could just pass a law that any platform that allows this would be shut down regardless of any other content or its popularity. That'd force them to curate their content on upload, not allowing it to go live until it was inspected by a human. Filter it with an AI, if need be, but make really sure it's biased enough so that nothing problematic gets through. Reuploads would have to go through the same process.
This should not be an issue on social media. It shouldn't be an issue with humans, either, but that's a more intractable problem since it's psychopaths who tend to be our more in the spot-light leaders.