But that is a general stereotype of black metal. There were plenty just in it for the music, who probably also wore silly make up and spikes and were too scared of their parents back hand to even spit on a church, let alone burn one. And from reading second hand reports it does seem like some of these guys had a strange sense of humour, even joking about the church burnings and such.
Plus everyone knows how messed up Varg is, so even if he decided to make garage punk he would have taken it too far somehow, just he did it in the name of BM. (Well ok, not in the name of BM by that point, but meh). But I won't believe he is the perfect example of a BMers mindset, seeing how he isn't the perfect example of a human being in the first place!
The point is there is a lot of BM stereotypes when there were only a handful of nutjobs and morons in the scene, as well as a bunch of teenagers making some innovative and cool music. And some not so cool, but tell me a genre that isn't like that?