Back in 3e, in a black ops campaign 'ripped from the headlines' we played from 2002, one PC had Fanaticism (US Safety) combined with Unfazeable.
A major theme of the campaign was the rest of the PCs developing PTSD, moral quandaries and crippling guilt issues, but the fanatic (game mechanically as a result of his Unfazeable), never questioned any of the horrible things he did.
Granted, the PCs were field agents and so never formally interrogated anyone, which meant that he didn't torture with the same relish as Jack Bauer, but that was merely because of division of labour. He certainly kidnapped people based on suspicion and used extraordinary rendition to send them to allied nations with no compunction about torturing them.
Most memorable thing about him is probably the many
Determinator things he did in combat. While other, saner PCs took cover from automatic weapons fire, the fanatic stood his ground and aimed at the machine gun operator while standing in the open with .50 caliber bullets throwing up sand all around him, finally taking him out with a single shot to the forehead.
Once, the fanatic also leapt on an accelerating car, punching a knife into the baggage compartment to help him hold on and then, inch by inch, climbed into the broken rear window using his two knives as climbing spikes, while the terrified driver floored the car.
Good times.