It is bad that we watch things go wrong without any action to prevent it. Touching part, there were persons who could intervene but they prefer to record and spread it online. We should focus more on saving lives than on filming.
It kind of reminds me the old saying about how all it is needed for bad people to get away with anything if good people who do nothing and get in their way. I believe it applies in this scenario.
It is not only the huge sense of invidualism which exist within the United States and specially in such a big city like New York, when each one of the residents seem to have adopted the idea they are on their own and not supposed to trust anyone at all, contributing to them just staying around and documenting and disgusting crime with their phones as if they were androids with no feelings or sense of empathy on what is going on, same for the police officers who were there and could have have de decency to apprehend the suspect at the spot for killing am innocent woman for whatever reason.
It only show who sick the west is getting and how likely it will continue to get worse with the divisive rethoric Donald Trump will push forward in the coming years.