I think it is somewhat ethical and unethical for Carl to kill Ben. Ben was a murderer, a psychopath that played rough-housing with the kids; he also poked at a carcass of cat in which he might have killed it. Also, he brutally killed Billy and then came back to the group and convinced them that Billy will come back to life since he didn’t shoot Billy in the brain.That is sick. If he did that to Billy, who to say that he is not going to do it again; he could bring harms to the group, threaten their lives. So for Carl to eliminate the threat to the group, it is ethical. But I can also see that he was not at right to do it, it was not up to him to make the final decision. He might have gone beyond his limits and that is pretty dangerous; for