I witnessed a rather gnarly bicycle accident a few years ago, and I did stop. But had I not personally witnessed the accident, had I passed by after the fact, and had I seen people on the scene, I certainly would not have stopped. And had I been on the sidewalk in Hartford last week and witnessed this accident, I like to think I would have had some more composure, and gone out in the street to direct traffic, but I probably wouldn't have. And I probably would have felt ashamed afterwards, and lost some sleep over it. But it needn't be so, as I don't think the pedestrians did anything wrong here.
Oh, and I watched this tape about a dozen times, and waved my co-workers over to watch it with me. What does that say about me? It's probably more damning than the behavior of the pedestrians in the video.
UPDATE: On subsequent viewing, I realized that the car immediately behind the hit-and-run vehicle, who appears to drive away, actually stops at the intersection where the assailant turned, and is presumably trying to get a license number or description. So that's one more person off the shit-list. I'd say people's ill will would be put to much better use directed at the driver who actually crossed the center divide, ran over a 78-year-old man, and drove away.