According to a strong and unrestricted version of the principle of sufficient reason, everything that exists or occurs has a sufficient reason for its existence or occurrence, where sufficient reasons are taken to entail or necessitate the existence or occurrence of the entity in question. For our purposes, call this version PSR.
Peter van Inwagen famously argued that PSR is implausible, as it entails that everything exists or occurs of metaphysical necessity, and that this is absurd (since many things seem to be contingent and not necessary). Call this the PvI objection. Now people tend to react to the PvI objection in one of three ways:
(i) Hold on to PSR, while accepting that it entails everything exists or occurs of metaphysical necessity.
(ii) Restrict PSR so as to make conceptual space for things to occur contingently.
(iii) Reject PSR in order to make conceptual space for things to occur contingently.
However, it seems to me that there is another option:
(iv) Hold on to PSR …