I remember reading something about the psychological effects of battle on the different branches of the armed services. It brought up how the air force as a rule are distanced from anyone they kill, so they don't often have quite the same.. visceral response to having killed people that infantry will usually have. Something about seeing a plane blow up, or go down in a crash doesn't create the same emotional response as actually seeing a human body directly.
Take that as you will.
Yep, he mentioned that he saw it as plane on plane, rather than actually killing a guy. I just chuckled at his remorse after he jumped a helpless opponent, that and the triumphant way the narrator announces that kill made him an ace. That show is somewhat interesting, but too US-focused after a while (granted, easier to find US vets for them).