Some Ohio lawmakers want to modify the state’s concealed-weapons law by vastly expanding the circumstances in which a person has no duty to retreat before using lethal force in self-defense. Such a “stand your ground” law is unnecessary. Worse, it would increase the danger of gun violence — something this state and its cities hardly need. City councils in several Ohio communities, including Toledo, Akron, Dayton, and Cincinnati, formally oppose the proposed bill. Members of the Ohio Student Association also have protested it. Current Ohio law states that people need not retreat in their residence, their vehicle, or the vehicle...