>No, nobody I know has had their bike stolen. I am acknowledging that bikes are sometimes stolen.

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?

So you are arguing that people you know only had their whole bikes stolen and not wheels/saddles/etc ? I don't think it's a good argument, tbqh. Even if the people you know made a meaningful sample of Chicago population (they don't) they still get bikes stolen and it still means the law is not enforced well enough.

And CPD can investigate all they want, CPD, like any other police department, cannot put people in prison. The DA has to press charges and prosecute in the court, which won't happen with any DA in any major city against homeless (otherwise all homeless would have been already in prison).

This is the ultimate American urbanist conundrum. Bikes are pretty useless for transportation in American cities because of rampant theft. Locks get cut in the broad daylight and even if the thief is too inept to steal an angle grinder, or already ran out of batteries for today, they will still rip off parts (wheels, saddle, brakes, group, they will even rip out lights from the mounts, just because). But they also cannot demand the law enforcement against it because the thieves are the precious "unhoused" (which is very easy to check by visiting any encampment and observing all the bikes and bike parts there). So we get this strange situation when cities build bike lanes and bike parks which are empty because, at most, you can only commute on your bike if your place of work has a secure storage.

Enforcing the laws against bike thieves would be 100x more effective in promoting biking than building anything.