Where were the guard rails, the security, track and train avoidance equipment, and on and on. Statistics, that's what it comes down to. It was predetermined that xxx number of people would be injured and or killed in the subway. There are no absolutes in this world. Statistically next time or two maybe some citizen will save someone. And out of the saves stistically a few will be given the hero award as outstanding citizens which makes everything look really civilized.
If the people in this thread had their vote on whether to help or not help it would graph out as a nice bell curve.