The "principle of alternate possibilities" (PAP), making the ability to do
otherwise a necessary condition for moral responsibility, is supposed by Ha
rry Frankfurt, John Fischer, and others to succumb to a peculiar kind of co
unterexample. The paper reviews the main problems with the counterexample t
hat have surfaced over the years, and shows how most can be addressed withi
n the terms of the current debate. But one problem seems ineliminable: beca
use Frankfurt's example relies on a "counterfactual intervener" to preclude
alternatives to the person's action, it is not possible for it to preclude
all alternatives (intervention that is contingent upon a trigger cannot br
ing it about that the trigger never occurred). This makes it possible for t
he determined PAPist to maintain that some pre-intervention deviation is al
ways available to ground moral responsibility.
In reply, the critic of PAP can examine all the candidate deviations and ar
gue their irrelevance to moral responsibility (a daunting prospect); or the
critic can dispense with counterfactual intervention altogether. The paper
pursues the second of these strategies, developing three examples of nonco
unterfactual intervention in which (i) the agent has no alternatives (and a
fortiori no morally relevant alternatives), yet (ii) there is just as much
reason to think that the agent is morally responsible as there was in Fran
kfurt's original example. The new counterexamples do suffer from one liabil
ity, but this is insufficient in the end to repair PAP's conceptual connect
ion between moral responsibility and alternate possibilities.