I am not proposing to change the software or criticizing the current policy. I always wanted to ask this question since a joined, since it is a glaring asymmetry.
Having raised over a thousand useful flags now, and consequently having read thousands of comments, I have noticed that (probably as a consequence) many of them are pointless or completely wrong, but nevertheless they always influence the reader (especially when the poster has a substantial reputation) and the only way to contrast them is to wait for a comment that refutes them and upvote the latter. When a posters is embarassed he can always delete it, and make the response incomprehensible, but, if nobody notices it (or is not able to refute it), it remains there forever.
I am sure that everybody is aware of this phenomenon, to some extent. I'd like to know what is the rationale of this decision, what are the arguments that can be/ are brought to prefer/justify this option. Any ideas?