We live in a very different world than the one that existed when HN first launched. Self-censorship and careful pruning of old posts is now a necessity for participating in public online discussions. Society is growing less tolerant of diverse opinions every year and comments that are within the Overton window today could get you fired from your job a few years from now.
I don't think we can even predict what opinions will inspire a Twitter mob in 2022. But inevitably one will come here and try to get someone fired for something, which will have a chilling effect on HN unless we can prune our own posts/comments as future situations require.