Maybe because internet grudges are retarded and pretty much anyone is welcome here as long as they can behave
I agree with Moriason as well, I mean, in real life you don't just:
"Hey man, remember me?"
"Yeah; you punched me in the face, stole my girlfriend, and made all my friends think i was a loser."
"Oh come on, that was YEARS ago, lets be friends, just forget that stuff."
It just doesn't work that way.
That said, however, this is a forum and I believe you should at least give the guy a chance to fuck it up again...if thats what is to happen. The worst that can happen is that everyone hates him because he is still a moron and he gets banned. Otherwise, who knows, he really might have changed. I'm sure he isn't worse than some of our members in G&D, anyway.