Well the weirdest thing is that the shooter absolutely doesn't fit the profile for these kind of guys at all. A successful retired millionaire accountant who was also a high-stakes Vegas gambler and whom nobody realised even owned guns. It's not the usual pattern of bitter loser taking revenge on the world, is it?
None of which is to say he didn't do it, of course. It's just a bit odd.
Wired $100,000 to his Philippine mrs, just before as well. All very odd.
Wasn't like he just snapped either, all highly planned out. Had plenty of time to have calmed down or thought about what he was about to do