It's funny because I always think about u-lock justice but I rarely if ever do anything. I suck it up. There are quite a few reasons but I've had friends be chased by drivers after a simple finger gesture and people get out of cars.

In some neighbourhoods I bike through, I dare not try anything.

Guns and gangs are very real in Chicago.

Making it to wherever I'm going sans confrontation and accident is a good ride. The traffic here and drivers' egos are just too big.