What really bothers me about this type of crap, besides the fact that the act was vile and repugnant, is that it reinforces so many negative stereotypes about metal in general. Metal doesn't need this kind of publicity. People who misunderstand metal and the people who listen to it just love this kind of shit, because it validates their prejudices (in their eyes). It gives them an excuse to point the finger at the metal community and say "SEE! I always said these people were a bunch of devil-worshipping drug addicts!"
It's amazing how the act of one brain-dead fuck can be a setback for an entire group of people, but unfortunately, that's how it's always been.