In the wake of the horrific terrorist attack in Christchurch New Zealand, it became known that the shooter had live streamed 17 minutes of his rampage to Facebook. In the video, of which I have only watched about 15 seconds from the point of the first shot being fired, the shooter can be seen extremely calmly carrying out his attack.
My question to the people here is, what is the root cause of a human being such as the shooter, being able to carry out such inhumane, disgusting, horrifying and downright evil acts whilst remaining so chillingly calm?
As someone with very little to no knowledge or experience with the relevant psychological literature, I have to ask, is this shooter a straight up psychopath? Surely the people who carry out such attacks have had some prior brain damage or genetic mental condition?