Earlier quoted context omitted.
Are they really breaking into your car just to steal your USB cable or is there other stuff you leave in plain sight?
I'm in San Francisco, so not Seattle, but cars get broken into for the sport of it by this point. A friend's had her window broken and used, gross dog leashes and an old Nokia charger stolen. The lost hours of work to replace the window was the real cost to her dog walking business.
I have a very messy car. Not rotting food messy, just a lot of clothes and things, often a lot of workout clothes, backup winter clothes, a couple blankets.
Thieves like clean cars. See target, break in, grab, leave. Messy cars are slow, annoying, and induce too much cognitive load.
If I lived in San Fran right now, I would have a shitty car with a lot of clothing in it just for the purposes of covering up things I don't want stolen and being annoying to thieves.