Why did so many brilliant people become insane?

The answer to this question is complex and there is no single answer. It is likely that a combination of factors, including biological, psychological, and environmental, contribute to the development of mental illness, including insanity.

At a biological level, some people may be more susceptible to mental illness due to genetic or neurological factors. For example, some people may be born with a genetic predisposition to mental illness, which can be triggered by certain environmental factors. Similarly, some people may have neurological conditions that can make them more vulnerable to developing mental illness.

At a psychological level, it is possible that certain life events or experiences may cause an individual to become overwhelmed and unable to cope, leading to mental illness. For example, experiencing a traumatic event, such as a death in the family or a serious injury, can be very difficult to process and may lead to mental illness. Additionally, people who experience prolonged stress or anxiety may be more likely to develop mental illness.

At an environmental level, certain environmental factors can contribute to the development of mental illness. For example, living in an area with high levels of pollution or poverty can be very stressful and can increase an individual's risk of developing mental illness. Additionally, certain social factors, such as discrimination or lack of social support, can also contribute to mental illness.

Overall, it is likely that a combination of biological, psychological, and environmental factors contribute to the development of mental illness, including insanity. It is important to note that mental illness is not caused by any single factor and that everyone's experience is unique.