Well, your argument is with Robert Towne and the late Hal Ashby, who worked on "Last Detail." I merely quoted from the screenplay.
I'm sure there were/are very nice Marines, and I knew a few when I was in the service. But I also knew some real --yes-- sadistic assholes, and that's drilled into them from boot on. It was drilled into us in Army boot, and there were some sadistic fucks there was well. That's what the military does, by and large -- tap into that violent core. My Drill Sergeant told us this all the time, that his job was to erase our civilian minds and develop our warrior minds. And as boot went on, the deeper this appeal went, getting us to scream and yell about the possibility of spraying commie guts all over the battlefield. Fortunately, I never saw the real shit. Of course, this was post-Vietnam, so nobody did.
I will say this about the service -- it politicized me. It's where I read my first leftwing literature. It made me a socialist. The military is a complex place, and it affects people differently, for good and ill. I'm glad to hear about you late father-in-law, and God bless him (no sarcasm). But don't tell me that there are no sadistic assholes in uniform. I was there. Indeed, I felt the pull for a time.
Dennis