Earlier quoted context omitted.
> My own theory of depression is that it is your brain's way of getting you to change something in your life that is counterproductive to your future wellbeing. Sometimes it isn't entirely obvious what exactly is causing the depression, but if you evaluate all aspects of your life and ask yourself "is this what I really want?", you will eventually figure it out. Utter crap. If I thought long and hard enough, my depre…
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Why? I can't see any basis for your belief other than "it just makes sense to me", which is the epistemology of bloodletting and witchburning.
Evolutionary just-so stories have been so thoroughly and repeatedly debunked that no one thinks they can be evidence for anything. They may be useful motivators for testable ideas, but that's all.
So where is your evidence, your clinical studies, your field observations? Anything. You've said that you believe clinical depression--a serious and even deadly disease--is caused by the brain trying to tell you there is something you need to change in your life, and given zero evidence for it. You've barely even motivated it.
Under those circumstances, one either has to assume bad faith, or an astonishing level of hubris and myopia. I'd say the person who responded to you was being rather generous, given what you've said is equivalent to, "It just makes sense to me that your cancer is just your body's way of saying that you need to change something important in your life, at least in the cases I've seen."
Anecdata ("the cases I've seen") is not evidence for anything, because we all know that humans are terrible observers and prone to confirmation bias and other problematic behaviours, so telling us "no really I saw this!" is not evidence of anything except what a naive observer believes, and again: that kind of thinking is what informed pre-scientific medicine for thousands of years, resulting in a vast amount of misery and very few effective treatments.