The muslim Emir who gave it away deserves the blame, and the stupid immoral Americans who wanted it do too. Return it.
I’m totally against the attitude that one must return antiquities to the country they originally came from. That’s nutz. Everyone would be exchanging everything with everybody. Ridiculous. We’ve got it, we keep it. But that means we take care of it too. Fix it up; it’s a priceless piece of history.
One example that comes to mind is the collection of art obtained by Mellon who got it at a cut rate from Stalin. Then when Mellon had tax problems he “donated” it to start the Natl Gallery. As horrible as this is, there are far worse examples of crooked art dealings.
These objects - many of which are an intrinsic part of the history of the place where they were created - belong in the places where they were created as much as is possible.