Why aren't all rule-breaking comments always hidden when the commenters are warned/banned for them? The reason creepy and aggressive comments are against the rules is because they're inappropriate and offensive and nobody wants to see them, especially not artists and character owners.
Anecdotal but one artist that previously let me upload for them went DNP in part over transphobic comments on their work. All those commenters had been punished already for the remarks, but staff left the comments up and the artist was understandably upset about still having to look at them when they checked the comments.