According to CBS affiliate KTVN, the shooter's motive was unclear, but family members said he had mental issues. He had never been in the military and had no known affiliation with anyone inside the restaurant.
How do these suicide-shooters always know there's nobody around who can shoot back? Spooky. Oh, and how did he get a gun?
(For the significance of the map, which is barely clear enough to show the location of Carson City and the nearby ley line, check the name I assigned to the map and my web-page entitled Satanism and the Earth-Grid.)