Several sites have reported the shooter had problems with 'hearing voices', so it's likely he was suffering from a mental illness more severe than just paranoid rants.
http://www.kirotv.com/news/29320281/detail.html
KIRO 7 Reporter David Quinlan was able to verify the authenticity of a Facebook profile run by Ficker. The profile included links to comments made on a website by someone under the username Ronald Ficker that mentioned hearing voices and "going to the stars." The poster also referred to himself as "Supreme Commander."
http://blogs.seattleweekly.com/dailyweekly/2011/09/ronald_w_ficker_issaquah_gunma.php
A week before abandoning his car in an Issaquah intersection, grabbing two rifles, and going on a shooting spree that ended with his own death, Ronald W. Ficker posted a link on his Facebook page to a support group for people who "hear voices."
http://www.msnbc.msn.com/id/4469303...-battled-mental-health-problems/#.TolxOrKaWuI
Mark Risdon, Ficker's best friend, said he saw warning signs and tried to help.
"I'm sure he wasn't shooting to injure anyone. It was some sort of cry for help," said Risdon. "That's why when we talked Thursday night, I knew something was wrong. That's why I tried contacting his doctor that night."
Risdon said Ficker was talking about going to space and seemed delusional. He said he knew Ronald was depressed, but had no idea it would come to this.
http://www.seattlepi.com/local/sound/article/Details-released-in-Issaquah-shooting-but-2194905.php
Police first interacted with Ficker Sept. 15,
when he walked into the Issaquah Police Station openly carrying a sidearm at his hip. He told the officer that he had concerns for his safety, because he had an invention that would save the planet.
Ficker willingly surrendered his firearm to police, while they checked to make sure he possessed it legally. It was a peaceful conversation, and the officer had no legal way to detain him.