I'm not implying anything. That's the point, the decision is up to individuals based on the information the have (or lack) at the time.
From your description of events, I probably would have stopped to help if I were in your shoes (because the extent of the problem was still unknown), and I probably would have done nothing if I were standing at the bus stop (because I would have seen that the situation was under control). The reason for the different levels of perception probably comes down to urgency and perspective. Being involved in the situation increases the sense of urgency to react, and at the same time your sight lines would have been more obstructed so would have had less info to work with before jumping out. There's also the issue of the safety of the scene (until people start to get out of their cars who knows if they might start moving again).
To bring it back to that video of the cop pushing the car and getting no help, my only concern (from my perspective through the camera lens) would have been for the cop's safety and I might have looked for an opportunity to block traffic with my car if I were in a position to do so. Otherwise I would have driven on. Perhaps from a wider angle we could have seen people blocking the lane he was in. I wouldn't run across traffic myself to help him push, because that only adds a new hazard.
Bottom line is it's easy to criticize the action or inaction of others, but when everything works out for the best then what exactly are we complaining about?
