I saw some of it. Couldn't figure out if it was a lame/failed attempt at scaremongering, or an attempt to actually give a balanced view.
I dunno... there's probably some link there (maybe only that disturbed people tend to listen to metal, even if it didn't make them wackos in the first place).
I think that just as high a proportion of disturbed wackos listen to other types of music.
Metal is just attacked because it's more blatantly/aggressively anti-Christian than other music.