I think the main thing here is that people deal with things in a different way. Making jokes about things, terrible or not, is all part of human nature, we're all wrong in the head at times!
She died young, and left kids, and it's terrible, but does anyone care? Sure SOME people do, but for the most part people have their own problems to deal with, making jokes about some pointless celebrity doesn't seem to matter to most people, and why should it?
The part that makes it acceptable to make jokes is the fact that no one on here knew her. Sure, if it was someone we knew it wouldn't happen, it's common sense!
This is just the way the world works.
But I'm sure I don't need to tell you that, just my thoughts