It's one thing to say cyclists should stop for red lights at the southern end of the park where there are lots of pedestrians (completely ignoring traffic signals) and entirely different to say they must stop for red lights throughout the park.
Over the past year or two, there seems to be a real increase in the number of muggings, particularly in the northern end around 103rd Street. Most of the muggings publicized were attacks on joggers for their mp3 players and maybe cash. That's probably because they're slower moving and often travel alone. If cyclists are required to stop for lights in the northern end of the park we're likely to see an increase in crimes against cyclists as well. Who the hell wants to stop and wait for a light when you're riding alone, after dark, particularly if there are sketchy characters or the usual mischievous teens nearby?