I mostly do that when I go "that was a little bit mean of me... do I really need to be mean, what's the point?"

Fortunately, that seems to also have trained me to not write those comments in the first place. I also think much more about what I am trying to actually effect with a comment, not just about what feels good in the particular moment.

One thing that didn't change though is that probably most of my comments are edited at least once, often a few times, right after sending them. And even if it's just swapping out a word, or adding a missing comma. This one here is no exception at all, I just added this paragraph after doing some minor edits.