So agree! I must live near you, since this is exactly what goes on here. I know 6 year olds already in palate expanders and braces. I know parents that will demand early braces, and will shop around to find an ortho to start NOW.
The reason? (I am talking about my general area, I know other areas aren't as bad about this stuff) - appearances, status and class. Braces and the resulting super-straight terrific smile are a status symbol to show the world. Every parent here wants their kid to be seen as someone of quality. And who is most likely to grow up with crooked unsightly teeth nowadays? Poor kids. No one wants their kid perceived like that, and who can blame them. Appearances matter. Kids who look good are treated better. Plain and simple. Everyone wants their kid to look good now and not have the gawky period for a few years. I know I would.
It's almost a "keeping up with the Joneses" thing here. Everyone wants those braces on their kids as young as possible, to show the world that their kid is destined to be a person of quality, and will get their share of the good life. I seen playgroups of 7 year olds - when one comes with a set of new shiny braces with a beaming proud mom, you can bet the rest of the mothers in that group run home in a panic and start calling orthos that day, to start work on their kid!
I know kids utterly embarrased to be in high school still in braces. It's seen as something that should have been taken care of by then. I also know kids with something in their mouths (braces, retainers, herbst, palate expanders, etc etc) for pushing 10 years, because of the rush to start early.
Sadly I lived this all this braces/status/class mania - my parents refused to fix my badly crooked teeth.

And believe me, I was treated different than my better-looking peers. Very obvious what a liability a poor smile is. I finally woke up to the teeth/status connection - had to use up all my savings as an adult to get over 3 years of work (braces and surgery) to finally look normal and advance in a professional career. Wish I fixed my teeth as a kid, lots of lost time and opportunies because of my poor appearance.
So yeah - the orthos won the war a long time ago. It's gotten to the point that you are viewed as a "bad parent" if you chose to wait.