"peace is an accident"

Sly was on Rush the other day talking about his new Rambo movie. I haven't seen the movie but he had this to say about a group of idealists portrayed
in the movie:

They actually believe what they're doing is right and that someday there's going to be this mystical moment and we're all going to join hands and sing "We Are the World," and when the truth is, Rambo says, "War is natural. Peace is an accident." That's a fact of life. It's unfortunate that we can start a war in five minutes, but it takes us a hundred years to make peace. So what comes more natural?

Stallone recognizes the human condition. Why is it that most of the rest of Hollywood doesn't?