[zimpenfish]

> Whom do you think they learned this from?

I suspect that in a non-ignorable number of cases, "no one", because it's entirely possible their brain chemistry is just screwy.

[DanBC]

No-one credible uses brain chemistry as an explanation for depression (unless you're talking about bi-polar). The emphasis is on the psycho-social bit of bio-psycho-social.

[zimpenfish]

> No-one credible uses brain chemistry as an explanation for depression

Presumably you're missing a "sole" before explanation there?

Because brain chemistry certainly seems to be definitely regarded as at least holding a coat even if it's not actively swinging punches.