I’ll try and answer seriously, with some non-exclusive options, in no particular order:
- Feeling ashamed, mostly because they’re realizing they’re either wrong or sounding stupid.
- Not wanting controversial stuff related to them to be “saved” for others to find and use for scrutiny.
- Honest mistakes (wrong community, thread, etc.)
- The post becomes a cesspool in the comments.
- Other personal reasons (feeling threatened, wanting a clean inbox, question got answered and they don’t care about historic purposes, etc.)
These are just my guesses though, and I try and not delete anything personally. I’m aware that anything I put on the internet will be immortalized, and that the healthiest thing I can do is own both my mistakes and my opinions, even if I’m convinced of my stupidity or ignorance at a later time. I’m only a human after all, and doomed to talk before I think. Best I can do is to learn as much as possible from it, and hope that others can also learn from my actions.
If it results in a basis of good values later in life, I’d say it’s definitely worth the time of OP.
However, it’s arguable whether making a post on Lemmy is the right way to get feedback on rights and wrongs, although I’m positively surprised by the comments here being so understanding and constructive.