I think a lot of the problem may be that an increasing number of people are living without family… not getting married, getting divorced, living away from other relatives.
People aren't meant to be alone.
It makes it more likely that a person will become miserable, drink, use drugs and kill themselves.
More than 40% of American kids are bastards. Add to that the number living without their dads due to divorce. It's no suprise mental health is getting worse… and more young people dying reflects that.