"Blessed are the merciful" in a courtroom?

Kurt Vonnegut just died. I really liked a few of his novels, like Slaughterhouse Five and Hocus Pocus. Here's a quote of his that bears repeating:

For some reason, the most vocal Christians among us never mention the Beatitudes. But, often with tears in their eyes, they demand that the Ten Commandments be posted in public buildings. And of course that’s Moses, not Jesus. I haven’t heard one of them demand that the Sermon on the Mount, the Beatitudes, be posted anywhere. "Blessed are the merciful" in a courtroom? "Blessed are the peacemakers" in the Pentagon? Give me a break!