So you feel down.
You visit a doctor.
He doesn’t know you can feel better by just taking a walk and looking at things so he does what he’s been trained to do.
He prescribes you an antidepressant.
The effect of which is to put you into a numb, non-empathetic, zombie like state where you are capable of shooting dozens of your classmates.
One other side effect of which is suicidal tendencies.
Yep.
That makes perfect sense.
To the criminally insane.
http://www.telegraph.co.uk/science/2016/03/14/antidepressants-can-raise-the-risk-of-suicide-biggest-ever-revie/