Peter van Inwagen is a modal skeptic. I think that 
modal skepticism is correct, but I don’t think that 
he puts it on a good foundation. After explaining 
why not, I sketch a better basis. I call it ‘abductivism’. 
I then show how abductivism secures one of the skeptical 
conclusions that van Inwagen wants: namely, that we aren’t 
in a position to know whether God could create a world 
sans gratuitous evils.