Not a safe holiday place. 
Supposed gunman moved multiple times, led obscure life - no socializing, was a pilot - owned 2 planes, had tonnes of money which was spent in Las Vegas.  Automatic weapons found in his room. Weapons fired from 2 windows. Was dead by the time police found him. 
Put 2 and 2 together - Vegas, Money, Weapons.  One may conclude he laundered money for drug cartel.  Unlikely he was the shooter.  Just follow the money trail.