The key to that question is the FBI guy Aaron C Rouse always looking creepy at the Sheriff. He was the section chief in the counterintelligence division of the FBI HQ. Which his job was prevents foreign intelligence agencies from successfully gathering and collecting intelligence.
In other words this attack was a foreign intelligence organized attack on us.
I personally think it was the Saudi's. They own a large part of that hotel. Which would give them special access.
So Paddock was an agent of the Saudis?
I suppose he could have been. But why?