In The Abuse of Casuistry Jonsen and Toulmin describe one view of moral reasoning as follows:Those who take a rhetorical view of moral reasoning… do not assume that moral reasoning relies for its force on single chains of unbreakable deductions which link present cases back to some common starting point. Rather, this strength comes from accumulating many parallel, complementary considerations, which have to do with the current circumstances of the human individuals and communities involved and lend strength to our conclusions, (...) not like links to a chain but like strands to a rope or roots to a tree.Whether or not all moral reasoning resembles “strands to a rope,” bioethics testimony certainly does. Bioethics testimony is eclectic, a composite of many loosely woven strands. Rarely, if ever, is bioethics testimony “a chain of unbreakable deductions.” Rarely is it “pure” ethics, much less pure normative ethics. (shrink)