It seems to me that (most) Americans agree with, and support, the ideas that lie in the basis of this industry: children need to be "put in their place", they need to be "broken down and re-built", etc. Americans love the whole power show, the drill sergeants w/ their Smoky the Bear hats, the yelling, "my way or the highway", etc. (me, I could never understand it-- like the way they make their military's basic training revolve around a show of power and control, not about actual combat-related training).
This industry is based on American culture. That is why most Americans-- those who are ignorant of the fact that many of these programs are in fact cults-- support the general idea of children getting locked up, humiliated, and broken down.
The reason why foreigners take interest-- I can only speak for myself. I find this industry, and the basic ideas on which it is based (described above), so disgusting, so appalling, so contrary to the natural instincts of humans (parents protecting their children from harm, society protecting its own young, etc.), that I can't help but keep an eye on this forum and the direction this industry, and American society, is taking. Watching American society these days is like watching a massive, slow-motion auto crash. A society turning against its own young citizens-- that is a true sign of sickness, and the beginning of the end, in my opinion.
I was in a state of shock for a few weeks after reading that Guardian article, and founding out about this industry, back in 2003. I was stunned that anyone would do this to a child. I hope for these children's sake that they'll be able to pick up the pieces and live normal lives.