Earlier quoted context omitted.
That brings up an old memory for me: I used to work as a lifeguard at a pool for three or four years as I was going through uni. Nothing glamorous in that work, it's just very loosely managing young males showing off in front of young females. Except this one time some kid jumped in the deep end and whilst he surfaced, he couldn't reach the top of the side of the pool in order to stay at the surface, he was clutching…
I vaguely recall a study where they took suicidal people and employed them as lifeguards with great results.
Most depression is the second type. So I’m not surprised giving people purpose shows great results. It would have for me, too.