tbh it's probably the best way to cope with a job that requires you to kill lots of people. if you took the time to feel compassion for everyone you had to kill it would probably be quite a hinderance.
and the point at which they thought one of them had an RPG, i findd quite understandable. Bloke crouching just round the corner with some heavy equipment protruding. i'd have ****ing **** myself.