Contributors to the debate on ethical rationing bring with them assumptions about the proper role of moral theories in practical discourse, which seem reasonable, realistic and pragmatic. These assumptions function to define the remit of bioethical discourse and to determine conceptions of proper methodology and causal reasoning in the area. However well intentioned, the desire to be realistic in this sense may lead us to judge the adequacy of a theory precisely with reference to its ability to deliver apparently determinate answers to questions that strike most practitioners and patients as morally arbitrary. By providing ethical solutions that work given the world as it is, work in clinical ethics may serve to endorse or protect from scr...