I'm not a fan either (and don't bother with it) but TikTok and co try to prey on your ... sorry try to show you stuff that they think you want to see, indexed on advert spend and a few other factors that will maximise advert spend return. That is their entire raison d'etre.
So, why on earth are they displaying stuff that you say is disturbing? There is no profit in that and TikTok is all about profit, ideally from abroad, ie market share.
I'm sure that the American population is incapable of being dumbed down any further.
Log a bug.