Owning up to our Agendas: On the Role and Limits of Science in Debates about Embryos and Brain Death

The ethical issues integral to embryo research and brain death are intertwined with comprehensive views of life that are not explicitly discussed in most policy debate. I consider three representative views – a naturalist, romantic, and theist – and show how these might inform the way practical ethical issues are addressed. I then consider in detail one influential argument in embryo research that attempts to bypass deep values. I show that this twinning argument is deeply flawed. It presupposes naturalist commitments that are at issue in the embryo research debate, and exhibits a blindness to alternative philosophical viewpoints. By considering the work of Hans Driesch, the discoverer of the facts of embryology integral to the twinning argument, I show how the twinning facts are compatible with romantic and theistic accounts that affirm full moral status for the early embryo. While these alternative interpretations might have a tenuous status in current scientific debate, they should be respected in ethical and policy debate.