If you look at https://news.ycombinator.com/newsfaq.html, there's an explanation there about how we usually don't delete entire account histories, but we do other things to help, and invite people to email us if they have concerns. There are tradeoffs between individual needs for privacy, fairness to the other commenters who participated in a thread, the community's interest in preserving its archive, and so on. We care about all of that and do our best to help whoever asks; as I tell people who write in, we just try to do it with more precise tools than wholesale deletion, and have built up a bag of tricks for that over the years. Obviously that doesn't extend to the Internet Archive or whatever other caches of HN posts are out there; users understand that.

When it comes to this sort of issue on HN, it's important for people to understand that there are no good answers—it's all tradeoffs. Because the pendulum has swung towards privacy concerns in recent years, we regularly get flamed for not deleting entire account histories. But we still get flamed from the classic internet perspective (nothing should be censored, etc.) too.