Wait, they got someone to diagnose a four-year-old as bipolar? The parents clearly aren't the only ones at fault, here. My diagnosis is considered suspicious because the disease doesn't usually manifest at all until puberty; mine (third grade, give or take) was abnormally early.
What's more, all the medication I've been prescribed (and granted, I haven't gotten the stuff for my actual bipolar disorder yet; I've been having problems with the state) thus far has had big warnings on it saying you shouldn't be taking the stuff if you're under 18. Rightfully, so, too; your brain hasn't finished developing yet, and you can really screw it up by fiddling with its chemistry too soon. Apparently, teenagers are more prone to addiction for just that reason.
But yeah, it's a real problem. And this coming from me. It's not necessarily that we're overmedicated as a culture; it's that the meds aren't going to the right people and are often going to the wrong ones.
ETA: And the woman prescribing my meds wouldn't put me on Depakote, because the side effects are so nasty!
"Now everyone was giving her that kind of look UFOlogists get when they suddenly say, 'Hey, if you shade your eyes you can see it is just a flock of geese after all.'"
"You can't erase icing."
"I can't believe it doesn't work! I found it on the internet, man!"