 But this route to compatibilism isn’t straightforward. Even without the help of PAP, determinism may still preclude responsibility due to the way it blocks alternatives (Frankfurt 1969; Blumenfeld 1971; Fischer 1982; Speak 2007). In FSCs, what makes the action inevitable doesn’t interfere with the agent’s own deliberative processes or actions: the “intervention” in these examples is merely counterfactual. By contrast, if determinism is true, its intervention is actual. After all, determinism entails that every detail of how we choose and act is fixed by factors in the distant past. As one might put it: in a deterministic world, we act as we do because determinism has put us on the single track, because we could not do otherwise. So even if FSCs show that the mere blocking of alternatives does not preclude moral responsibility, determinism’s distinctive way of blocking alternatives is still a threat. (In light of this point, one could reformulate the above incompatibilist argument explicitly in terms of the particular way determinism blocks alternatives. The modified P2 would not require PAP, though it would need a weaker principle.)