Time for Video?

A video has emerged from New Jersey of a mother being beaten to a pulp by another woman in a McDonald's uniform while only the two year old son of the victim tries to intervene. My questions are: Why did the person taking the video not step in to protect the victim? Why did the witnesses not shout at the perp to stop the attack? Why did those who sat on their hands at least not yell for the attacker to run because "the cops are on the way"? Those observing the assault could easily have stopped it with little personal risk. By not attempting to break up the altercation, those watching and filming it showed that they lack citizenship, decency, and even humanity. When you can stop an attack that could lead to horrible injuries, permanent disability, or even death but opt only to record it, you show yourself to be something less than a human being.