A satisfactory normative theory of acceptable risk would be useful in resolving current disputes over government safety regulation of the workplace, consumer products, and technology. Alan Gewirth has attempted to develop such a theory, arguing from the individual's right not to be harmed by the risk-imposing activities of others. His theory is analyzed in detail, and the difficulties faced by such rights-based (deontological) approaches are pointed out. It is argued that a satisfactory theory will not be of a simple rights-based (...) form. Reason is also given for doubting that it will be of a simple utilitarian form. (shrink)