Arnold knew who did it. It was one of those kids, the ones who hung out on the porch, like that one who kept lighting his lighter and putting it out, obviously a flame freak, like the one who started the fire in the dumpster, just for kicks, fire department and everything, they never caught the guy, but he knew who did it. It was one of those kids, the ones that hung out with Jamie, the guy in the attic, in the primo spot, the only room with a view, and he'd been there for years, always with the good bud, maybe even a dealer, which would make sense, that they all got high before setting the dumpster on fire. They musta thunk it was real funny, well hah hah, how do you like them apples? He knew Jamie would tell him who started the fire because it was his fault for getting them high before they must have set the dumpster on fire, even though Jamie was in Ballard when it happened and it was only when coming home on the 44 he saw the fire trucks and the cops. Jamie didn't know what happened and took no responsibility for what anyone else did upon leaving the House of Glitch, stoned or not, but Arnold didn't see it that way. It was one of his favorite dumpsters to dive, ground zero for one of Seattle's finest collectors of things other people threw away, and if that preoccupation occasionally warranted actually stepping into the container to retrieve something, so be it. The hapless pranksters just wanted to see flames but had instead angered Shiva, goddess of dumpsters, the holy land had been violated and the heathens must pay, and the only possible connection to anyone in his universe was those kids on the front porch who must have smoked a joint with Jamie.
And so he stormed off to give Jamie a piece of his mind. Jamie, meanwhile, didn't know what the fuck was happening with Arnold, whom he considered a benign sociopath who lived on another floor and needed to be spoken to softly. He didn't like Arnold's tone of voice and was particularly upset about being blamed for something he knew fuck all about. If one of the kids who actually set the fire hadn't come by to separate Arnold from Jamie, someone would have gotten punched, so it's a good thing he was there, though he actually didn't know either of them and was just there to see Angie, who also bore no responsibility for the torching of Arnold's shrine to Shiva.
Arnold never got revenge but Shiva gave Jamie a bad case of the crabs when he mistook her for a cheap hooker.
Moral: You never know when you're going to piss off one of the Gods so you may as well do whatever feels good.