military training in and of itself doesnt brainwash you. a lot of people who are looking for attention might call themselves "brainwashed" or what not, but its really just for that attention.

as for what we're capable of: everyone is capable of it, just less likely to act. granted, if soemthing went "bang" back home you wouldnt start ripping apart anyone who looked even remotely responsible. you do in the sand box though because its a necessity to stay alive.

spend enough time unloading corpses from your trunk or the top of your hood, you start to see things in a larger picture. in the grand scheme of things, would that person have helped with anything that grand? no. so is what we did to him really that aweful, in the big picture? not at all. good, evil, they dont exist. each of our own little worlds do exist though, and we might as well stay in them for as long as possible. its survival, not horror.