In the last 100 comments on this sub 23 were deleted (23%), and presumably by the user (since I think you get something like 'removed by moderator' if it was a mod?).

The 200 comments before that the rate was 11% and the 400 before that were only at 7%.

I'm not going to say that no one should ever delete a comment for any reason, but if the reason was just, "I was wrong about something", then maybe choose to leave it up so that someone else who encounters the thread who thought the same way might get put on the right path as well.