It doesn't take much to go from your Friday night out, to a few after work to being that man in the park.
Baby steps into heaven or hell perhaps.
Often we find it hard to face the problems in front of us especially younger people who don't understand the world as well.
I think that the problem is going to get worse. Not necessarily substance abuse but the luck of world experience in general is going to present in many different ways. The rise of depression is just one of the symptoms.