I'm sure those repugnant assholes do it "for the lulz" and if they want to mess with you they'll do it anywhere.
There's this study that says playing Tetris helps ease recently acquired trauma https://www.ox.ac.uk/news/2017-03-28-tetris-used-prevent-post-traumatic-stress-symptoms
And the admin from his eponymous instance dbzero created an interesting script to get rid of CSAM without having to review it manually, take a look -> https://github.com/db0/lemmy-safety
I think the whole 50% depopulation is a flawed premise, of the hundred of thousands of years modern humans have existed that would throw total population back to... 1970