A stopped clock is still correct 2 times a day and it may well prove out that some many were calling hoaxers may be on the right trail, not about everything of course.
There is a lot of brainstorming going on.
Facts (so far)
Successful white guy lets loose on concert with full auto and semi-auto firearms on a crowd from a hotel window. Kills 50, wounds or causes injury to over 500.
Girlfriend in PI.
Shooter killed at the end of the spree
Shooter took trouble to smuggle a great deal of ammo and unusual number of firearms (for one guy) into the room.
Shooter used GF's ID to check in.
All the theories will be trying to figure out why an apparently wealthy white guy would shoot up a music festival, or whether any crowd would do...and if that, why?