Abstract

Philosophers employing Frankfurt-style cases to challenge the principle of alternative possibilities have mostly sought to construct scenarios that eliminate as many of an agent’s alternatives as possible—and all alternatives at the moment of action, within the agent’s control—without causally determining the agent’s actions. One of the chief difficulties for this traditional approach is that the closer one gets to ruling out absolutely all alternative possibilities the more it appears that agents’ actions in these cases are causally determined. “Limited-blockage” versions of these cases are meant to sidestep this worry by blocking all and only those alternatives that are intrinsically relevant to moral responsibility (“robust alternatives”) while leaving open all other alternatives, including a significant range of alternatives that are within the agent’s voluntary control at the moment of action. I argue that, owing to the fact that omissions (and not just actions) are capable of constituting robust alternative possibilities, limited-blockage cases cannot avoid collapsing into the more traditional sort of Frankfurt-style case to which they are meant to be an alternative and so are vulnerable to the very same concerns they are meant to avoid