If anyone is morally responsible, there must be things we should do. Or so goes a natural thought. If I am blameworthy for stealing a cookie, for instance, then I should have resisted stealing the cookie. But what if history and physics causally determine my every act? Then, many worry or do not deny, I cannot do otherwise. If I cannot do otherwise, and given that should implies can, it is obviously false that I should not have stolen the cookie. Therefore, moral responsibility requires indeterminism or at least some access to alternate possibilities. The preceding argument appears to refute semicompatibilism (the view that moral responsibility is compatible with determinismDeterminism, of which ARC is a particularly strict example).