When a dog visciously attacks someone, they are put down. Why is it different with a person? We are just animals, too. Also, methodically killing unarmed, incarcerated humans? Okay, how about we go for a little
Running Man action? Then they can turn a profit, and create entertainment. Plus, if they get whacked, they probably weren't fully unarmed.
I just don't see the sense in keeping refuse around to rot, even if said refuse happend to be made of the same carbon I am.