I read something the other day, I should have copied the link because I can't find it now. That linked a coup in Saudi Arabia to the Las Vegas shooting in short it said that Prince Mohammed bin Salman was in Vegas at the time and the shooting was a diversion or possibly a purchase of weapons to assassinate him that went wrong. That would be a good reason for the Gov. to seize all of the surveillance footage to cover up an attempt on a foreign leader on US soil.