frantz fannon wrote about keeping our identities separate. he was one of the early practitioners of psychotherapy, and he was treating a police interrogator. this was a long time ago and in another country, so he was really beating the shit out of people all day. one day his wife talked back to him and he hit her. it scared him, because he had never been a violent man in his private life. fannon basically came to the conclusion that you can't have these two separate lives without the line between them blurring. anyone who goes home thinking about their job and goes to work thinking about their family knows that this is true.
it's interesting that, with the way war has changed, our government hasn't adapted to releasing veterans into society. we saw it happen with vietnam, and (to a significantly lesser extent) it's still going on today.