I doubt people would admit to killing Bob the next day. But people would talk about the bullshit Bob made everyone put up with, and the motives leading to his death. And maybe that would curtail people doing bullshit on the daily.
I expect that after the first few purges, most of the people missing afterwards would be the poor and vulnerable who aren’t able to defend themselves from the group who just want to kill.



Unfortunately can’t codify how platforms work soecifically into law.
But you could possibly explicitly make companies liable for promoting “detrimental” content. Then define “promoting” as something like “surfacing content to a user beyond the reach of the users immediate network. Ie algorithmic suggestions or advertising”