I'm going to have a very hot take on this subject...
I believe it has to do with the overuse and abuse of medications they now give children and teenagers. When you are diagnosed with ADHD and prescribed Ritalin, then expected to perform perfectly because of that, it's going to put a lot of stress to people that haven't even finished developing.
While I'm not fully against medication, I don't believe we should medicate children unless it's absolutely necessary to do so. And I've been on them long enough to realize they do more harm than good. Take two kids with ADHD, put one of them on Ritalin, the other without it, and then after six months stop the kid who had Ritalin from getting their medication. It would be disastrous for the kid to come off the medication. The kid that never got Ritalin would still have problems, sure, but nowhere near as severe as the one who had to come off of it.
People don't realize that the brain is flexible and partially adapts to the medication you give it. I am in such a fragile state right now because on my three psych meds and if I can't get them for whatever reason, like I develop an allergy to one of them that actually happened recently, I have to be rushed to a psych ward while they monitor me adapt to a new medication. Thankfully the transition between Lithium to Tegretol wasn't too harsh, but I was in a wreck as the doctor was trying Trileptal that wasn't strong or potent enough to do its job against my bipolar agitation and irritability.
We need to let children be children and if they get sad once in awhile not jack them on anti-depressants or other drugs that could make the situation significantly worse, to a developing mind, than actually treat the situation. I get it. In clinical depression, some people are just sad for no particular reason, and meds can resolve some of those issues. But anti-depressants are being thrown into the mix to treat a variety of issues now - Wellbutrin is even given as a dietary aid and/or smoking cessation product.
We need to stop overmedicating society and our children before they all end up like me - on welfare, taking a handful of medications every single day just to feel okay, and having the feeling of the void without a nuclear family, job, car or significant other.
Before I was diagnosed with mental illness, my mom used to try to sympathize with me and tell me to do better, but after she treats me like I'm not even human anymore, blaming all of my problems on either a lack of meds or being on too many of them.
We have become the medicated society. Had I not gotten my first antidepressant that swung me psychotically manic, my mania would have kept being in remission. Medication should be used as a last resort, not the first.