I'm not aware of anyone claiming that mental illnesses are solely due to genetic factors.
That's correct. No one was quoted as making that claim in the OP.
However, it took me about a second just now to find this popular article, written by a PhD and reviewed by a board certified physician, which states, "There is a very strong genetic component to schizophrenia." And "The evidence of a genetic predisposition to schizophrenia is overwhelming."
https://www.verywell.com/what-causes-schizophrenia-2953136 I take it you agree that the actual evidence contradicts these claims.
I read an abridged version of Leo's article in Slate and thought it misrepresented a few things about psychiatry, such as that the foundation for psychiatry using medications to treat psychiatric illnesses is the theory that they're genetically based. Um, what? That doesn't make any sense.
You will notice that I quoted his explication of the relationship between "genetic theories and the medicalization of psychological stress":
It is impossible to separate genetic theories from the medicalization of psychological stress. The widespread use of psychiatric medications is based on the idea that schizophrenia and other psychological conditions arise, in part, from genetic defects that result in biological alterations such as reduced levels of neurotransmitters, or deficits in neuronal circuits, that need to be fine-tuned with medications. In general, higher genetic contributions to a disease equate to a stronger case for pharmacological treatment, while diseases with a higher environmental component are seen as better candidates for lifestyle changes and therapy. In 1996, in regards to ADHD, Stephen Faraone, a leading psychiatric genetic researcher, stated: “Many parents are reluctant for their children to take psychotropic medication and others find it difficult to maintain prescribed regimes. These problems are mitigated by discussing the genetic etiology of ADHD…” If parents really believe that their child has a measurable chemical imbalance, then just as they would treat their diabetic child, they would surely treat their child diagnosed with ADHD.
http://issues.org/32-2/the-search-for-schizophrenia-genes/
What do you claim Leo misrepresented here?
Do you agree with Faraone's statement that Leo quoted? Faraone claims that "the problem" of parents' reluctance to start their children on a regime of psychotropic drugs is "mitigated by discussing the genetic etiology of ADHD"--by which he apparently means fabricating stuff about "the genetic etiology of ADHD".
This Leo guy is not a psychiatrist, a biologist, geneticist, pharmacologist, or trained in the relevant fields, anyway. He's a neuroanatomist. So I want to know more about the anatomy of the brain, I'll pay attention to him. Otherwise, he's a layman.
So you think that neuroanatomy is just unrelated to psychiatry? It is true that no mental disorder listed in the DSM or ICD is either defined or diagnosed on the basis of any neuroanatomical or neurochemical criteria. Yet, one can find all kinds of assertions such as the very first sentence in the above popular article, asserting that "Schizophrenia is an illness of the brain . . ."
A 2010 essay by Dr. Thomas Insel, originally published in
Nature and reproduced on the NIMH website, advocates that schizophrenia is a "neurodevelopment disorder":
http://www.nimh.nih.gov/about/director/bio/publications/rethinking-schizophrenia.shtml In the process, Dr. Insel also speaks of and advocates genetic studies as a way to "separate cause from effect" in schizophrenia. Do you say that he's is also confused about the (alleged) relationship between psychiatry, neuroanatomy and genes. His article is rather out-of-date on the findings of GWAS in people diagnosed with schizophrenia.
I also see that he is commonly cited on anti-psychiatry sites, which raises red flags
What are the "red flags" about? Can you point out any error in anything "this Leo guy" has stated?
By the way, what is your area of expertise on the topic of genes and mental disorders? Are you qualified to evaluate or comment on scientific studies and the peer-reviewed literature?
How do you account for the racial/ethnic disparities in the diagnosis of schizophrenia, as found by Bingham et al.?
How do you account for the racial/ethnic/cultural patterns of Criterion A symptoms by which schizophrenia is diagnosed, as noted in the McLean et al. study?