Notice the lack of any numbers collected by anyone about how many of these kids are being raised by just the mother. Most women cannot handle an unruley child. Sure, there are exceptions, but most mothers can't do it. Funny how ADHD didn't become a problem until the divorce rate and single mother households grew to the obscene levels they are have been at in recent years.
In short, follow the money. Large, powerful industries have grown by exploiting kids and gullible parents. Get the government involved (schools, social services, "family relations" courts) as well, and you get this kind of mess. These parents need to wake up. They are being used, and their own children are being used as pawns in someone elses game.