There is a little more to the story than in this short article. Mr. Kirby chose not to fight this and took a plea.
His actions were not totally "innocent" according to others. Apparently he had a bit of a "Wyatt Earp" attitude about him and was resting his arm on the grip of his weapon while "eyeballing" numerous people around him. Not just a case of going about his business but being conspicuous in his actions while carrying.
Another person, Josh Watson, was arrested in a similar case in Vancouver. He was hanging out near a closed Pizza Parlor that had recently been robbed. It was snowing and he was purposely OC'ing even though he was also wearing a Ski Jacket. His case went all the way to trial and he was convicted by a Jury selected from a pool predominantly comprised of gun owners.
In this case even an Attorney who volunteered to handle the appeal pro bono has lost interest.
Sometimes OC'ing CAN be viewed as an attempt to intimidate. One does so at their own risk and it would behoove the OC'er to be on their best behavior with a very positive attitude lest they too fall victim to RCW9.41.970. The "I'm right, you're wrong" attitude put forth by many OC advocates can come back to bit them in the ass as this case and Mr. Watson's has shown.