Buddhist belief in Psychopaths:
In the Mahaparinirvana Sutra the “icchantikas” (i.e., a species of being who can never attain Buddhahood) are deeply evil.
They don’t believe that all beings have the Buddha-nature.
They wish to harm others.
They take pride in their twisted views, and live lives contrary to the Buddhist precepts. Especially, the icchantikas conceal the evils they have done some of which are grave in nature.
Nor are they capable of repenting their sins. As far as their spiritual capacity is concerned, they have “no capacity for saddharma” (true Dharma).
The Buddha refers to icchantikas as “the incurable ones.” …
The rest of this article from zennist.typepad.com makes the link with psychopaths and goes on to discuss the pervasive nature of the problem in society.