Period. It is about revolting against the establishment. Sometimes just for the fun of it. But it applies everywhere. For example, metal-heads are often labeled as satanists. Flip side, if everybody was a satanist, metal heads would be priests and prophets and seers.
photo : .....And Justice For All (Metallica)......go listen.
2. Realm of the Untouchable
We fear what we don't understand. And that is heavy metal territory. Metal gives you the right and the channel to fantasize about something that "normal" people would never think of. Think death metal, black metal. Its gory, macabre. As is some aspect of every art form. So nothing is ever off limits for metal. In short, the true unlimited wings of imagination.
image : Wretched Spawn (Cannibal Corpse).........go beserk.
What do you want to do when you are pissed and disturbed? You want to scream, curse and shout. What do you do in heavy metal? You scream, curse and shout. And lot of people can identify with it. Restraint and self control is good, but healthy release of such pent up angst is even better. And not just getting in everybody's face, but also be true to what you feel. Popular is not always good. As I said above, nothing is off limits with metal.
image : Live in UK (Rage Against the Machine).... go scream!
And yes, its about excellence. Heavy metal demands excellence. A sloppy guitarist or a poor singer can never cut it in heavy metal. They go pop!....very literally. Metal music demands you put your energies into it. And teaches you that it's the same with everything you do. Then it can be playing blazing guitar solos or cranking up good grades in school. Dedication to what you do, is of utmost importance. (On the subject of good grades.......i know we metal heads are not famous for that......but still, there is always hope.....:D)
image : Systematic Chaos (Dream Theater).....go work hard and be as good!
5. Identity and Integrity
Above all, it is being what you are, as yourself, than becoming a moronic copy of the hordes. To preserve what is the quintessence of you and being true to it. If you believe something is right and true, then stick to your guns and never back down. Your own lyrics, your riff and your song. Now, thats very very metal!
image : Piece of Mind (Iron Maiden)....go fucking be yourself!
These are true life qualities and attributes that are deified/diabolized by metal. People can embody these principles and still not be metal heads. And you know what, metal heads are the only people who can understand that feeling. That is why heavy metal rules!