Those who deny that that had anything to do with this, and it was only a "brain disorder" or other such claptrap are truly insane.
I've had students who for years were systematically abused and tortured by adults. This abuse caused them pain, distress, depression, and suicide ideation, not a chemical imbalance. Despite this, counselors they saw diagnosed them as having a chemical imbalance and pumped them full of pills that have psychosis and suicide as known and documented side effects.
Who is insane in this situation? Who is responsible for the damage it causes when a young person is targeted for destruction by sociopaths and it causes them to crack? A chemical imbalance? Not the things that are being done to them by others intentionally trying to harm them?
This attitude justifies the abuse of people. This attitude leads to suicide. This attitude needs to stop.