Bigotry.
Mental illness has nothing to do with how happy one is.
Psychoquackery.
There's plenty of evidence, that the best & brightest have more mental ailments.
https://www.sciencedirect.com/science/article/pii/S0160289616303324
In this study, mood disorders included depressive disorder, dysthymic disorder, and bipolar disorder. Estimates of mood disorders within the adult population range from 8.4% to 12% (Olfson, Blanco, & Marcus, 2016; Pinto Pereira, Geoffoy, & Power, 2014). As expected, there was a higher incidence of mood disorders in the high intelligence sample; 17.3% more than the national average as reported by the NIMH (Kessler et al., 2005). The associated RR is 2.82, which indicates an increase of risk by 182% for those of high intelligence in developing at least one of these mood disorders. For the combination of diagnosed and suspected diagnoses, there was 3.85 times the risk (an increase of 285%).
Anxiety disorders in this study included generalized anxiety, social anxiety, and obsessive compulsive disorder (OCD). As hypothesized, there was a greater prevalence of anxiety disorders among those with high intelligence: 9.1% more than the national average when limited to these three categories (Kessler et al., 2005). Overall, there was 1.83 times the risk of being formally diagnosed with anxiety (an increase of 83%). When including those who suspected that they should be diagnosed, there was a risk of 3.42, an increase of 242% as compared to the national average.
Prevalence of ADHD (and the older diagnosis of ADD) was significantly greater in the high intelligence sample—an increased prevalence of 3.3% compared to the national average (U.S. Department of Health and Human Services, 2002). Overall, those of high cognitive ability are 1.8 times as likely to be diagnosed with ADHD compared to the national average (an 80% increase). Further, when combined with those who suspected diagnoses, there was 3.39 times the risk of developing ADHD symptoms, a 239% increase compared to the national average.
Autism spectrum disorder (ASD) includes the DSM-IV diagnoses of autism, Asperger's syndrome, and other PDDs. ASD is typically only studied in children, thus rendering comparisons between prior studies and this sample difficult.