Every once in a while someone has a heart attack on the New York subways, nobody responds to his/her distress, and commuters step over the body for hours.
I find this very hard to believe. I always find people in the subways very helpful. If they left a person alone for hours, they probably thought he was sleeping. But at the time that he was in obvious distress, someone would have gotten help. I've seen it happen. And usually too many people are trying to help and I worry that the person is getting overwhelmed and not enough breathing space.
Once I was on a train and someone passed out. She was in a seat (as opposed to standing where it would have been more obvious) and at first the people next to her weren't sure. So they tried to wake her up. When that wouldn't work, they sent someone to the 3rd car where there is always a conductor. In the mean time, someone suggested to look in her purse for any medication that might give a clue about her having a medical condition. The conductor came, and at the next stop they held the train, and some police officers were waiting to help her off the train and bring her to the emergency room. By this time she was conscious, but looked very out-of-it.
I've also been on a train or bus where someone said outloud that they weren't feeling well. Everybody responded. (And then of course there was the time that someone wasn't feeling well on the express bus while it was on the highway. We were about 2 or 3 minutes from the toll plaza just before the Brooklyn-Battery tunnel, where there are lots of police often. But instead of driving 2 or 3 more minutes, the driver pulled over to the side of the highway. It took about half an hour for a police car to get to us and pick up the sick passenger. The driver insisted that it was the policy. We was not allowed to drive another 2 minutes, even though it would have meant the person got attention half an hour sooner.)
It is really hard for me to imagine NYers acting like the media-portrayals of them. Walking on the street, if someone looks even slightly confused or lost, people ask them if they need help.
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Of course it is a different issue entirely if helping a person comes at risk to yourself. I can see people avoiding getting involved when something violent is occurring, out of fear for themselves. But everyone would call 911. (NYers operate under the assumption that if more people call 911, they will arrive faster.)