 Such doubts may be viewed in light of the widely held presumption that, free will (or perhaps, more broadly, purposive agency) aside, causation throughout nature is, fundamentally, causation by events or states. Until recently, even most proponents of agent-causal theories have accepted this view. And with this view granted, an appeal to agent causation in a theory of free will may strike us an implausible claim of metaphysical exceptionalism.