One of the most consistent precipitants of mental illness and drug abuse is trauma. Having worked with a number of psychotic individuals, there is likely no evolutionary advantage and psychosis is a result of "faulty wiring" and or environmental triggers. It MAY have some sort of fight or flight function but it is important to recognize there are various types of psychotic symtpomatology (acute, chronic, paranoid, delusional, etc).
Sorry, but "faulty wiring" falls in the domain of natural selection. It doesnt explain anything
. (Granted recorded history of people could be said to too short a sample size.)
There are plenty of cases where people experience symptoms of mental illness with no "trauma".
https://www.google.com/amp/s/www.schizlife.com/john-nash-and-schizophrenia/amp/
It just turns out, those are the same people who can work past it without life-long psychiatric and psychological help.
I'm not trying to invalidate your work or opinions, but your field is tied to some big existential implications, which no one seems ready to address. For example, if we look at a floor that's not level we can describe in great detail what level is, almost to a 'T' using simple tools, classical physics, and language. We can do that for practically anything we have reasonable access to.
Now, how do you describe a
normal mental state devoid of mental illness? What tool do you use to describe that? Bank account and spending analysis?Brain chemistry is often cited, yet effective diagnosing is lacking unless the brain chemistry is completely skewed.
Taking steps to help mental illness is only justified by the
statistics of newly reported functionality obtained through treatment by people aligned with the person now seeking treatment.
It defies true understanding, objectively, so it must be rationalized through spiritual means or other powers of consciousness itself, such as introspection. Ideas like karma and a beyond. Friendship and trust.
That said psychiatric drugs are effective, mostly for their ability to put you to sleep, but some even have side effects that give you stronger erections, lol - like Seroquel.