- People spend a lot of money on them (no subsidies available for this particular music, and in fact heavy taxes all around).
- People get hurt. They get stamped down, kicked and pushed.
- It's a "closed venue" for the handicapped, and very petite individuals can get seriously hurt if they enter the thickest crowd.
- Property gets damaged and lost. Try watching your money or set of keys in a crowd during a heavy metal concert! You just have to hope they stay in place. Sometimes they don't.
- The lyrics are so nasty! They speak of death, mutilation and other nasty stuff.
- No-one can really breath that much during a heavy metal concert, not even when they are held outside. The body mostly inhales sweat and air with little oxygen.
Just a thought.