 What Swinburne says here is surely very reasonable, and I can see no objection in principle to a defense of this sort. The problem with it is that no theodicy that has ever been proposed has been successful in the relevant way—that is, there is no impressive range of undesirable states of affairs where people initially think that the wrongmaking properties of allowing such states of affairs to exist greatly outweigh any rightmaking properties associated with doing so, but where, confronted with some proposed theodicy, people come to believe that it would be morally permissible to allow such states of affairs to exist. Indeed, it is hard to find any such cases, let alone an impressive range.