As several of you noted, it could be a case where some people were shot from somewhere and fake elements were added to blow the scene into a massacre for use in behalf of some agenda or the other. A professor in Canada, who I know and to whose intelligence and integrity I can attest, reminded me that the Northwoods Project, a false flag attack proposal given to President John F. Kennedy by the Joint Chiefs of Staff to produce an excuse for invading Cuba, consisted of both real and fake elements. The professor analyzed the Northwoods proposal and provides this list of the fake/real mixture:

Dear Craig: I thank you for carrying an honest discussion on your website of the difficulties in sorting out whether Las Vegas victims were real or fake.