OK. Reality check here. You're bent outta shape over a stomped and abandoned, rusting UJB belonging to a convict....
Thinking about stealing it. Because that's what you're doing actually. You are no more liberating it than we and the Brits liberated the natives in Africa from their lifestyle and placed them into slavery.
If you do steal it, it will be under the watchful eyes of the homeless and who knows how many others.

I think there are more better things to be spending your time on, than to visit a guy in jail. Attend an auction if the cops take the bike and it doesn't first disappear. Move on, there are more bikes in the world awaiting us, with less baggage.
This is not a pet, a living thing being abused which requires our intervention...rescue.