This question already has an answer here:
I recently realized by accident that, when deleting your account, your comment upvotes are not removed, unlike up/down votes. Just as an example, I posted this comment on a site where I didn't previously have an account, and upvoted it 10 times by deleting and recreating my account (hopefully that's not considered abuse because I was testing a bug on a useless comment).
Supposedly, all votes are supposed to be removed when the owner's account is deleted (except in the case of high reputation users). Is it intentional that comment votes are kept? If so, why?