Dear art world: Why is stealing a wallet not appropriation art?

Link:

It’s a few weeks after the latest Richard Prince brouhaha, and as expected things haven’t changed. The art world has come down on the side of Richard Prince, with the argument basically being that it’s a terrible ruling for appropriation art because it’s a terrible ruling for appropriation art. I might be missing something, but in none of the articles I’ve read any of the defenders of Richard Prince has given an actual explanation of why this particular case is a valid case of appropriation art