This site shows his death pic as well as what appears to be a written note that he left behind - http://www.zerohedge.com/news/2017-10-03/vegas-shooter-filmed-himself-during-slaughter-suicide-photo-emerges
If that is what it looks like, then we are going to know soon enough what motivated this POS.
What is “Military grade” ammunition? Did he have depleted uranium rounds?
"The FBI took all digital and electronic evidence into custody".
What could go wrong?
This be a real head scratcher.