"people's brains are not broken."

You do realize this happens a lot too, right? Especially with how bad the current Western culture is for healthy mental development (it's a Narcissism machine for women and suicide machine for me).

Mental illness absolutely makes sense. Not sure how you could claim otherwise. Never dated a Borderline, have you?

Do you have any qualifications to speak on this topic? Do you understand what the word normal means, and how you can determine when someone isn't?

It's called statistics, fyi.

Do you just deny the existence of things like schizophrenia?

"Without providing any actual citations, I'll claim the DSM is invalid by assuming my own argument"

Ah, great. Glad we got that cleared up.

The reason clinical depression assumes a chemical cause is because while you are diagnosing a patient, you are supposed to rule out legitimate causes of grief (which is diagnostically distinct). You have already ruled out other explanations by definition.