What seems missing is rational enough explanation for the guy doing what he did --if real and actual crazy can be rationally explained, anyway.
How to cope with, and at arms length (don't want to get too close to it) grok the sort of senseless crazy the pictures we get of the man who was otherwise maybe not so crazy? More like wealthy and eccentric. The gambling thing though, that does demonstrate a significant degree of selfishness was part of the man. Then again it's a bit like video games with a monetary component...
It's no wonder there's so much speculation. There could be something to some of the speculation -- but which parts of the speculations?
So many bunny trails, not enough time to find the one or more magic rabbit(s).
I still hold the belief this man was part of something bigger than himself. While I'm not inclined to believe the multiple shooter theory at this stage, I do believe he was being manipulated to act outside his character (willingly, by force, or for financial gain). Of course, his life ending act muddies up the financial gain theory... or does it?