Lol! So firing a gun does give you a woody? Sounds like rationalization to me.
I am a history buff. When I would read about ancient battles and how it was common practice that after an army took a city they would go on a rampage of indiscriminate killing, raping and pillaging I could not understand how they could do that. Now I do.
My hypothesis is that combat results in our reptile brain becoming extremely active. In fact they have done functional MRI’s on combat veterans with PTSD and there is way more activity in the reptile portion of the brain then there is in people without PTSD.
I am not rationalizing it. It is still wrong by our societies standards. The military puts alot of time and money into training Soldiers to be discplined and not allow those impulses to take over.