Nonetheless, Warren grants that her argument entails that infanticide would be morally acceptable under some circumstances, such as those of a desert island. Philosopher Peter Singer similarly concludes that infanticide, particularly of severely disabled infants, is justifiable under certain conditions. And Jeff McMahan grants that under very limited circumstances it may be permissible to kill one infant to save the lives of several others. Opponents may see these concessions as a "reductio ad absurdum" of these writers' views; while supporters may see them merely as examples of unpleasant acts being justified in unusual cases.