Except that there is evidence showing that some mental illnesses, especially ADHD and depression, are being over-diagnosed.
While you're right in saying that you shouldn't just not take your medication because of some youtube video, you also need to consider that ADHD is treated with an amphetamine, or amphetamine derivative.
Many parents push doctors to prescribe medication when it's unnecessary, as used to happen with antibiotics and viral infections, and many doctors are paid by drug companies to promote medications. Then there is the recreational use, which has definitely caused many a teen to fake ADHD symptoms.
Basically what I'm saying is that Robinson's point was not that ADHD doesn't exist, it was that there is a disproportionate amount of ADHD medications being prescribed in the eastern US.
ADHD is very common in California. I was originally in a program that many might be familiar with called GATE and was later on disqualified from it due to having too much energy and not being able to sit still. Was then later diagnosed ADHD, and have always been this way. There are truths to the notion that someone with a severe amount of ADHD might have issues with a wide ranging variety of things like education, relationships, and so on, there is far more importance on helping the person understand what it is they have and how to deal with it, far more than just slapping a pill on them and making them think this will make them better. Ritalin, for example, is a crack pill, and does nothing to help the person in and of itself. Furthermore, it was hilarious how doctors throughout my life were nothing more than pill pushers in this circumstance trying to force medication upon me, warning me of the plights of life and how I won't be able to deal with it. I was also in programs with other people who had ADHD and noticed I was one of the worst cases, yet even as a kid the only one who even understood what it was I had and how to cope with it.
So in a way I agree with you and greatly disagree with Reneer, but since this topic is about education and not how crappy the health care system in the US is, I will make another note that in 6th grade I was suspended roughly 20 times, mostly due to the teacher I had being an old, inconsiderate [censored] who knew that I was ADHD but instead of helping me learn in the ways described to her, she tried to separate me from class and instead of being inclusive, was exclusive, which resulted in me lashing out. To put it mildly, putting someone in the back of a classroom with 6 foot cardboard preventing them from seeing the rest of class because of their restlessness is not a way of dealing with a student who has ADHD. Her methods were sadly supported by my school, and my mother, noting the adverse affect this medication had, allowed me to finish 6th grade in home school. I actually did fine in school, graduated when I was supposed to, and maintained a 3.7 GPA in college, without applying to the DRC (disability resource center) as people wanted me to.
Certainly ADHD is an issue, but it really depends wholly on how one defines it. Yes, there is an exaggeration of cases in the US, and yes there is without a doubt plenty of pill pushing doctors trying to medicate kids as a solution instead of helping them cope with what they have, but those who do have it need help in understanding what they have and possibly what sort of accommodations they might need to be able to learn. ADHD is not the only affliction, and I say affliction because there is a wide variety of behaviour outside some ambiguous and changing version of "normal", I maintain skepticism about the ways people in the US manage and define these behaviours, increasingly attempting to label those who simply act outside of the "norm" as having a disorder, and the crappy way the US education system handles individuals regarding these ambiguous afflictions.
To put it bluntly, and in a sound byte-esque sentence for some American to easily quote and use to disagree with, the US education system stinks.