That's exactly what happens. The algo does not judge how hurtful a rabbithole may be - it optimizes for engagement with some moderation sprinkled on top. I've tried to make my facebook feed palatable for a couple months and eventually passed up on trying. I'd rather IM my family about cat photos than engage with their fringe political views. Same goes for colleagues on LinkedIn.
Tentacrul did a good video on it and more across the years https://m.youtube.com/watch?v=MPyJBJTHyO0&pp=ygUWZmFjZWJvb2s...