PORTLAND, OR — Tension rippled through Powell’s City of Books on Tuesday after a smooth-skinned weirdo with no visible tattoos and—more disturbingly—no bumper stickers on his car was seen casually walking into the store. Witnesses say the man, described by one employee as having “the unsettling neutrality of an Apple Store mannequin,” appeared to be in his early 30s and wore jeans not cuffed at the ankle and a plain sweatshirt that did not reference a band, a podcast, or late-stage capitalism....