I don’t see any moral or ethical issue with celebrating someone’s death.

Objectively, if the guy was a bad person, then he was a bad person. Literally, the whole world celebrated when Hitler died, and nobody seems to have an issue with that. Now, all of a sudden, we’re supposed to be better than that?

I think if you’re the kind of person, or public figure in this case, whose death people celebrate, that’s more of a reflection on that person than on the people doing the celebrating.