HOW DOSE IT HAPPEN

ok so you all must have heard that a man in long island NY was trampled to death by shoppers, ok someone pushes him over he falls ok so he breaks a leg or something, but for him to fall then other humans step on him over and over till he dies. come on people why didn't some one help him, we are not animals are we do we not have a caring bone in are body, we as humans should be ashamed of this, i work as a volunteer firefighter and i see this type of hostility growing day by day hearing and seeing people fight,stab and shot over nothing, just the other day my station was called to a elderly residence because a 15yo boy beat her badly. that wasn't the worse part it was his grandmother and he beat her up cuz she only gave him $20 for his birthday. Now the questions are how do people think this behavior is ok, and how can we as humans help prevent this.