Orrin Judd, in an only tangentially related (and well worth reading) post, quotes A Few Good Men, a movie of which I'm very fond (and he is not). I will therefore share my favorite part of the movie:

Son, we live in a world that has walls and those walls have to be guarded by men with guns.

Who's gonna do it? You? You, Lt. Weinberg?

I have a greater responsibility than you can possibly fathom.

You weep for Santiago and you curse the Marines.

You have that luxury. You have the luxury of not knowing what I know: That Santiago's death, while tragic, probably saved lives.

And my existence, while grotesque and incomprehensible to you, saves lives.

You don't want the truth because deep down, in places you don't talk about at parties, you want me on that wall. You need me on that wall.

We use words like honor, code, loyalty...we use these words as the backbone of a life spent defending something. You use them as a punchline.

I have neither the time nor the inclination to explain myself to a man who rises and sleeps under the blanket of the very freedom that I provide, and then questions the manner in which I provide it.

I'd rather you just said thank you and went on your way. Otherwise, I suggest you pick up a weapon and stand a post.

Either way, I don't give a damn what you think you are entitled to.

A friend in high school and I used to quote this to each other all the time.