Moonchild, I agree with you, but if you allow me, I would introduce some variant. You say:
"We all make mistakes and this is no exception. We all deserve the right to apologize and make amends. We all deserve a fresh start."
Yes, but if I recognize to have been a personal attacker, an anonymous or false-identity flamer, or a saboteur to a group of people, I SHOULD identify myself and make my apology PUBLIC, not privately commented to one member who will respect my privacy. Only then I will deserve a fresh start.
Besides, who, under a shell of anonimity, could claim for a "respect of not being blamed for the actions of others" ?

I think that a self-introduction and a public apology is what this person should do, if he wants to be respected, regardless of his music knowledge. I bet that then, we'll all be glad to welcome a new member.
Un abrazo - Andrés