But then again

This is a depiction of Judas betraying Jesus. That's a bad thing, right?

It's a sixteenth century masterpiece by the Italian painter Caravaggio. So that's good, then?

It was stolen from the Ukranian Museum of Western and Eastern Art in Odessa last summer. A very bad thing, no doubt.

But then the authorities recovered it. Great!

Some experts, however, believe it might simply be a reproduction wrongly attributed to the master. So what should one think?