People doing nothing to help is nothing new
This is true, and it brings me to another observation: lack of response is often due to shock factor rather than cowardice or unwillingness to help. It's happened to me before, nothing that severe, and I thought later, why didn't I do it this way? And I've had the exact opposite happen, where my my reaction was instant and correct. Hard to know how you'll react without being there, only what you think you would do.