McGrath,

A psychopath is a person who is defined roughly as someone who is disconnected from any sense of empathy or understanding of the emotions of others.

Psychopaths are often intelligent and appear otherwise balanced, though they are without exception deeply narcissistic and motivated by selfish interests.

This guy fits that profile pretty comfortably.

The right wing connection aspect is a concern, but his behaviour clearly goes beyond the bounds of a healthy mental state.

All those who wish to excuse or to explain his actions via political considerations are deluded in the extreme.