I'm not sure they're the same thing. While there certainly are some people who are keen on violence, hasn't there had been a lot of changes to the psychology of the training over the years because historically most people found it quite difficult to point a gun at someone and shoot?
So, I wouldn't link being aggressive, or "a nutcase", to a culture that isn't keeping up with the rest of society. I've got close friends in the armed forces, who don't have those attitudes I described, and when I told them I was surprised at the casual slurs etc., they pretty much rolled their eyes, and said it wasn't a surprise.
Also, to be clear, it appeared that things have improved, so you'd hope it was heading in the right direction, just a few decades behind most other work places I've seen.