The question Lumifer raised was if mental illness is really that common.
Not quite. I pointed out that mental illness can be defined in different ways (DSM was not brought back on stone tablets from Mount Sinai) and these different ways will give different answers about the prevalence of mental illness.
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There are two battling narratives of mental illness. The first narrative says that mental illness is a disease of the mind, the second that it is a disease of the brain.
The "mind" story is that these illnesses come from bad ways of thinking, whether this be childhood trauma, diseased patterns of thoughts, etc. The treatment is therefore in psychotherapy, CBT, or other such. To the extent that this narrative is true, discussion of mental illness is likely relevant to rationality.
However, the other narrative is that mental illnesses come from chemical imbalances or other defects in the brain. The cure is therefore lithium, SNRIs, etc. To the extent that this narrative is true, rationality doesn't have a lot to say about mental illness.
Your post suggests you like the "mind" narrative. But to the extent that LW is a hive of reductionism, it may be that the "brain" story is considered more appealing here, and this may explain why there is less discussion of mental illness than you find conducive.
My opinion is that saying that all mental illness falls into one camp is oversimplifying. Someone who's schizophrenic is definitely in the brain category, according to the current consensus I've seen. Depression is moving into that camp. Anxiety is on the fence- it can be chemical or mental.
If I were to answer "is mental illness a mind thing or a brain thing?" my answer would be "neither, both, one, or the other" because the brain is a complex thing and breaks in a lot of different ways.
Anxiety, for instance, is typically treated with temporary medication and long-term therapy. We treat it as "mostly mind, hint of brain."
Depression is treated with long-term therapy AND medication, or just medication. It can be a product of thinking patterns, but the consensus now seems to be that it's mostly a hormone thing.
It feels, to me, like if two groups were arguing "grass is yellow" or "grass is blue" when most grass is green but there are weird variants that are yellow or blue.