This argument makes even less sense then. You proclaim that stealing bike parts is an absurd idea and never happens based on the people you know, yet now you say that you don't know any people whose bike was stolen? If you believe things that don't happen to people you know are absurd and don't happen, then should not you be consistent and believe that bikes don't get stolen? Or, if you admit that bikes get stolen, even though not from the people you know, then should not you also be open to the idea that bike parts get stolen too, even though not from the people you know?

>And no, the DA does not withhold prosecution for theft based on ones housing status.

That could be very true and DA does not charge any bike thieves regardless of their housing status, but still the effect is the same - homeless bike thieves are never charged and convicted (using "never" statistically, probably there are some convictions but nowhere close enough to make bike theft dangerous for the criminals). Since you seem unaware: drive around and observe homeless riding bikes and guiding another one or two. Sometimes you can even see bolt cutters on them. Do you think they do this on the way from their bolt-cutting job to the bike-valet job?