Who Burned the Museum?

The Conflict Antiquities blog is reporting on various theories on who burned a museum in a Kurdish area within Turkey.   It makes for interesting reading, but all the speculation glosses over an important point.  Museums and archaeological sites in places like Egypt, Iraq, Syria and now Turkey have become targets precisely because hated dictatorial or authoritarian governments have appropriated the past to help further their own agendas.   So, is the greatest threat to the preservation of the past in such countries Western collectors or the nationalistic regimes that use the past to lord it over the locals?