There are two sides to this and I think they're important to distinguish: If the person in question was wrongfully accused, this could do undeserved damage to him. This would be a misfortune (albeit not a great one given how little activity my comment generated) but I'm currently sufficiently convinced this won't happen that I went ahead and posted the comment.

The other matter is rehabilitation. Whether he should be allowed to apologise at some point, say that he made a mistake, and be welcomed back, is something that you cannot decide for everyone. It's up to your personal beliefs, in particular your religion. Everybody needs to determine that for him- or herself, in my opinion.