 The early critics of the doing/allowing distinction focus on appealing to intuitions to cast doubt on the claim that commonsense morality attributes significance to the doing/allowing distinction. Rachels (1975) and Tooley (1972) offer contrast cases in which all other factors are held constant and killing and letting die seem morally equivalent. Kamm (2007) and Frowe (2007) respond by arguing that we do not treat these cases as morally equivalent, while Kagan (1988) and Quinn (1989) challenge the inference from the moral equivalence of the cases described to the general equivalence of doing and allowing in general.