The kids who commit violent crimes while on multiple psychoactive drugs are on the drugs BECAUSE they were already severely messed up. Claiming a causative relationship here is like claiming that keeping a record on criminals' past convictions causes them to commit more crimes, since criminals disproportionately have criminal records. These kids have psych records because they were psycho BEFORE they started amassing their psych records.
The closest plausible thing to a causative connection is that medicating psychologically disturbed kids gives parents and school officials and others in authority a false sense of security that the kid isn't dangerous now that he's on meds. The meds are rarely that effective, and even perfectly sane and stable people tend to forget to take prescribed medication from time to time.
"The kids who commit violent crimes while on multiple psychoactive drugs are on the drugs BECAUSE they were already severely messed up"
Hogwash.
No, it is not the same. Three different studies now have shown strong evidence of "violent outbursts" or "rage events" in children who have no prior history of such behavior, as a result of combining multiple antidepressants or an antidepressant with a stimulant.
Moreover I disagree further with you that medicating kids gives parents and teachers a "false sense of security". What is far worse is the epidemic of children being medicated for "not sitting still" and "class-disruptive behavior" (which means basically just 'being a boy'), and being put on psychotropic drugs such as Ritalin, Prozac, Paxil, etc. The result is a child unneccessarily sedated, and an increased risk of future violence from that child as a result of the drugs, where that behavior never existed prior.