Although psychos have abnormal brains, they don’t have defective brains, since–according to naturalism–there’s no way the brain is supposed to be. And psychopaths can be highly functional.

On this view, morality is arbitrary. Morality is an artifact of brain structures. If you change the wiring, you change morality.

In theory, evolution might have made psychopathic brains normal rather than abnormal. The majority might have psychopathic brains. Empathetic humans would be abnormal. From a naturalistic perspective, that’s all there is to morality. Rewire the brain and you get a different moral code. There’s no right or wrong way the brain is supposed to be wired. That’s the outcome of the blind watchmaker.”

http://triablogue.blogspot.com/2017/10/the-psychopath-inside.html