These studies presume that contributions from genes to schizophrenia are varied with many different loci underlying the disease.  The penetrance of these supposedly genetic components is “highly” variable and many genes involved in ASD are also involved in intellectual disability and schizophrenia, further underscoring their lack of specificity in phenotypic expression.  Let me interpret the above.  We have no idea how or why we say what we say.  We basically look for some similarities, fill out some questionnaires, and then speculate and surmise conclusorily blaming our genes.

We now know that neurotoxins (lead and mercury) cause injury to the brain, which manifest as complex disorders of the brain such as ADHD, low IQ, autism and schizophrenia. A group of real scientists found out that there were clusters of areas, old houses with lead paint or the communities surrounding a chemical or coal plant, where there was striking similarity of complex disorders of the brain between parents and their children! On another front, more real scientists began understanding and mapping out the human genome (GWAS), and their studies began finding that there are no genes for these complex disorders of the brain and that even if you clustered a million genes together, you still could not explain anything!

We have been dumping insane amounts of toxins into our environment for the last century.  Psycho-socialists (eugenic movement) have been claiming, like the authors here, that “genes”, whatever that means, increased the likelihood of complex disorders of the brain.  What has been lacking from this irresponsible claim is any explanation as to how or why.