Supposedly the mummies were beheaded as a sign of disrespect, because anything dating to the time prior to Mohammed is considered by Muslims to be evil.
Apologies for jumping in here mid thread, but I saw your post and it mirrored a discussion with DH last night - Essentially that if this country experienced riots in D.C., that yes, the Smithsonian would sadly, probably be looted...because we have arrived at a place where (for the most part- thankfully not all), the citizens have experienced a total disconnect with their own history, just as the Egyptians have : /
May God give us the strength we will need.
Tatt