I guess if a bike has been locked up for months at the same place outside, you could say that its owner abandoned it due to theft of parts, but is it right to take parts yourself?
I’d say when a stolen bike reaches this point, propped up against a garbage can, you can feel good about taking whichever parts you want:
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I don’t know which SFGov agency is in charge of clearing out San Francisco’s numerous locked-up bike carcasses. Maybe it’s DPW?