Actually, I do think there are clear evidence for the biological basis of mental illnesses. Mental illnesses run in families, and some people have genetic predispositions towards them. Many details of mental illnesses remain unknown, and social environment does play a role, but it's not causal in nature. For example it's well known that people are born with a set level of happiness, which social environment cannot permanently AND drastically affect (although it may affect it temporarily and/or incrementally)
At the core of the debate here are different philosophical beliefs about human nature. Those who deny the biological basis of mental illnesses must belief in the humans as a blank slate. A belief incongruent with all the modern genetic research, and what we all know now about the human nature.
At the core of the debate here are different philosophical beliefs about human nature. Those who deny the biological basis of mental illnesses must belief in the humans as a blank slate. A belief incongruent with all the modern genetic research, and what we all know now about the human nature.