A person in the commission of a crime should suffer whatever consequences befall them without legal recourse, including injury or death.
Absolutely. If a criminal has been caught, the punishment can "fit" the crime as the legal system has the criminal to punish him and make him pay restitution. Before a criminal is caught or during the criminal act the aggrieved party has no assurance of retribution or restitution. Killing or injuring a thief in the act is absolutely morally righteous but unfortunately not legal in most states.