This reminds me of a thread a couple of months back where a girl admitted on this site to being a bully, and she found out that the person she and others mercilessly taunted had gone and committed suicide. The OP of that thread then went on about how she felt no remorse for her own actions and felt that people going to the funeral were hypocrites and idiots. After many of us reported her and informed mods, and called her out on her bitchiness, she was permabanned.
In that case, the entire Escapist community was ranged against her. This thread could not be any more different. I think a lot of people, myself included, will support you here. I was bullied myself at school, and though as far as I'm aware none of the bullies have died, it only stopped when I managed to get one of them expelled for drug-dealing. He was the ringleader. And I can safely say that five years on, if he and I met in the street, he would probably resort to the same bullying tactics as before. Maybe even worse considering he was expelled from school because of me. If he was to suddenly drop dead, or be killed, or whatever, I sure as hell wouldn't be happy, but I wouldn't be sad either. I just wouldn't care. He was a complete and utter bastard who loved to torment me as much as he could, and tried to get others to do the same. If he was to die I would be completely indifferent, in fact the only people I would have any shred of sympathy for would be his family, and that's because at the end of the day I'm still only human.
I guess what I'm trying to say here, OP, is that you are perfectly justified in feeling the way you do, and that doesn't make you a bad person. If it does then I myself would be on a one way ticket to hell. I have to say, OP, I agree with you completely. There is no reason why you should have to feel sorry for the death of someone who, quite frankly, probably wouldn't care if you were the one who had died.