If I solve my dispute with my neighbor by killing him, I have certainly solved the immediate dispute. If my neighbor was a scoundrel, then the world is no doubt better for his absence. But in killing my neighbor, though he may have been a terrible man who did not deserve to live, I have made myself a killer - and the life of my next neighbor is in greater peril than the life of the last. In making myself a killer I have destroyed the possibility of neighborhood.