I also wonder if this dude cleaned up his trail prior to committing the crime, given how much effort he put into setting the whole thing up.

Like, you'd picture he left a computer behind with all kinds of usable data, but I'm pretty sure he knew his trip to Mandalay Bay was going to end with him dead, so he probably destroyed all evidence he thought could piece things together (unless he wanted it to be found).

This isn't someone who abruptly snapped, or whose plans were interrupted mid-stream. He was fully aware that he would be caught and killed, and was probably all ready to pull the trigger on himself before anyone got inside.

I'm starting to think that we may never figure out a motive. Perhaps something just went off in this guy's brain at some point that he wanted to kill a whole lot of people and then off himself. Psychos aren't usually very rational.

I still find it quite hard to believe that this guy was radicalized by ISIS. He was 64 years old and supposedly wealthy, with no known political or religious affiliation. White Americans who get radicalized like that tend to be young and directionless.