Like it was said above: context. I would not be happy that someone died--it's never good--but I would feel satisfied that justice was done to a murderer or relieved that a dictator could no longer hurt others. Those are simply examples and would include anyone doing wrong, no matter how minute. I think a lot of people feel this way.

However, picketing at a funeral is disgusting and cheering about the death of a man is uncalled for.