 This line of defense finds a home in some versions of agent-causalism, on which, not just free action, but action simpliciter requires agent causation (Taylor 1966; Steward 2012b; Brent 2017). On this picture, the difference between what I do and what merely happens to me is that I am the (or a) cause of the former, not the latter. Now add a second, logically independent premise that agent causation requires alternatives. If someone is necessitated, either internally or externally, it is the compelling factor, not the agent, that causes the resulting event, which thus is not an action. Not all agent causalists endorse both premises (Clarke 1993 and O’Connor 2000 deny that action simpliciter requires agent causation; Taylor 1966 and Markosian 2012 deny that agent causation requires alternatives). But joining the premises entails that action—and thus morally responsible action—requires alternatives.