When does bad taste become violence?

I couldn’t resist Googling around about Danzig the other night. It’s pretty hilarious the sorts of things you find on the internets.

But this mySpace page is particularly disturbing. At first, it seems like nothing more than a testament to questionable tastes. Then the guy tips his hat to Falling Down, wherein Michael Douglas can’t get breakfast three minutes after a McDonald’s switches to its lunch menu, and he goes nuts. Maybe it’s okay to like the movie, but to build a public shrine to it?

Which begs a question suggested by Polansky’s post the other day: at what point does poor taste in art and literature turn into Columbine or the Virginia Tech massacre?