"Kant stated simply enough, "[Punishment] must always be inflicted upon [the criminal] only because he has committed a crime."7 Punishment shouldn't be meted out for the criminal's own good, for example, for reformation or rehabilitation. This would be treating him like an animal, like a dog. Also, punishment shouldn't be handed out for the good of society, such as for security, deterrence, or crime prevention or any other desirable end. The criminal shouldn't be treated as a mere means; we shouldn't use people for society's ends, "for a human being can never be treated merely as a means to the purposes of another."