For depressed people I wonder. How much is it the brain's "fault" or is it genuinely something (a lot of) thing(s) wrong in the person's life?

It's easy for example to overlook trauma, and just blame ourselves "why can't we just be happy" or our brain's chemistry, while ignoring all the terrible things that happened to us, because it's too painful to relieve them.

Aren't treatments like this like reducing a person's fever by force (which they got because of a bacteria infection) while not fixing the underlying issue that caused it in the first place?

TL;DR: Instead of asking "What's wrong with you?" and making that part right by force, shouldn't we be asking "What happened to you?" and helping with that?