In Goleman's book "Social Intelligence" he talks about the Dark Triad in relation to lack of empathy.

The triad consists Psychopaths, Narcissists and Machiavellian types. The idea is that those in the dark triad are arch-types. They either lack empathy or turn it off. He talks about the I/it & I/you relationships and how these types view others as "its".

Is it possible that extremists who adopt terrorism as a tactic fit into this dark triad? Does it matter when considering their motivations?