How would the OP chase down the offending red-light runner without running red lights himself?

These red light debates are getting rather tiresome. I think most would agree that "blowing" red lights without slowing down is reckless and presents a bad image for cyclists. However, karma is likely to catch up with such offenders in the longrun, either in the form of a ticket or collision with a car.

The OP isn't clear whether he is opposed to cyclists who stop for red lights and then proceed when the coast is clear. Many of us who commute or ride in urban areas treat red lights as stop signs. The reasons are that many traffic signals do not detect bicycles and those with many red lights on their routes could take forever getting anywhere by waiting for every light to change. If you want to be legalistic and sit at every red light until it changes, be my guest. However, don't presume that lecturing such red-light runners will make any difference to them or the world. I personally wait for most red lights, but run certain signals (after stopping) because I don't see the point in waiting for hours at traffic lights. Some of the lights on my regular routes absolutely will not change unless a car comes along to trip the signal, and don't try to tell that's due to some fault of mine. I've sent emails to city, talked to the city bike coordinator and tried various means to trip signals, but the problems are never fixed.