We seem to fundamentally differ in our views about metal as an expression of something essentially societal.
I do not believe that it is.
I think that metal actually touches something independant of our experiences of the social order. I think that it touches something hardwired into the human soul: the desire for power, for conflict, the raw fierce joy of life.
When I was a child, I used to love to watch the discovery channel. I took deep pleasure from watching animals hunt their prey, watching their intense physicality and their vicious focus.
Similarly, I had a passion for fantasy. When I was probably two or three years old, I was really, really into Masters of the Universe. But only Skeletor. With his muscled body and his grinning deathshead face, he is an image of almost pure, "dark power". From that age until present, the Deathshead has been kind of sacred icon for me, which stirs things inside of me that I don't quite have words for.
Also, as I said before, I think that children are less frail than we often imagine. Less frail, and more wise. Frequently, they are more 'in touch' with their inner workings than adults, who are more or less socialized into a kind of numb, droning state where task performance and linear intelligence are their only means of apprehending the world.
I think this is where some familiarity with Jung's concept of the "collective unconscious" may become appropriate (although it is actually a much older idea, the origins of which stretch beyond our knowledge of history).
To me, metal is Nietzschean. It is also "Evolan". It is "Apollo and Dionysus fused", and it is the seamless unity of the "Solar and Cthonic". Everything that is awesome, brutal, terrifying, beautiful, feral and well ordered about nature is expressed in the very best metal, just as it is in the very best classical. It is not a "reaction against something", but rather a CELEBRATION of something which is basically eternal and not contingent on the vagueries of politics, economics, sociology, etc. And I think that this is precisely why we have the lyrical focus in metal that we do. This is why paganism pops up in it, and why Satanism pops up in it, and so on.
And that's what originally attracted me to ANUS. They seemed to sense this, and accordingly, to take it seriously.
Note that your child may not be this way. YOU may not be this way. There is nothing wrong with that, obviously. This isn't meant to be a statement of "my experience is more elite and true than yours", at all. I'm just offering you an explanation of my experience, use it as you will, and good luck!