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Trying to help those people with talk therapy or exercise or companionship would be as futile as using those things to treat hepatitis or gangrene.I get what you want to say, but to nitpick the analogy: If the "treatment" for gangrene is amputation, then that's not really "fixing" anything. That's just the scorched earth strategy of destroying the afflicted along with the affliction. Like lobotomies. What do people think of them now?
> Someone with severe melancholic depression could win the lottery one week, lose all of their family in a plane crash the next, and feel literally nothing about either event.
Why SHOULD someone feel a specific feeling about any event? If you're subconsciously aware of the ultimate pointlessness of any event, if you're aware that feelings won't change what happened, you won't. You'd move on and handle the new reality in the means available to you.
I'm not saying that medicine should never be used and there's never a "chemical" cause to sadness (or any "wrong" feeling), just that it may be used too often as a lazy escape for the "helpers".