-restoring them to their countries in protected spaces would increase tourism and therefore economy in these countries. This would allow for more stabilization within these economies- which would even help from the standpoint of that threats like terrorisim occur in places where poverty is rampant.
Countries feel like their artifacts have been stolen or pillaged from their country then you can see how they Should be sent back to their country of origin! .
Cultural treasures should be displayed in the context in which they originated; only then can they be truly understood. I definitely believe that cultural treasure must be returned to their place of origin.