Help! Help!!!!! Anyone?

I'm walking down the street to my apartment when I hear a woman screaming. At first I think its just some friends in the middle of an escalating argument. Her screams get progressively louder and more frantic. 

When I turn around, I see a man sprinting towards me with a bag clutched against his chest. Behind him is a woman screaming, "My passport is in there! My passport!!" Accompanying the woman is a male friend who continues to chase the robber when he turns a corner. I instinctively reach into my bag to call the police but realize that I left it at home. I ask two onlookers to call the police. I get empty stares in response. Thinking that they don't understand Mandarin Chinese, I then approach another bystander and ask him to call the police. He takes out his earpiece when I say, "Excuse me?" but then puts it back in and keeps walking down the street after he hears my request. I then ask my doorman to call the police. He asks me, "Yea, but where is the robber?" Hello?! He's running down some alley - I don't know where he is! Apparently, if you don't see the criminal, there is no point in calling the police. How is this mentality helpful?

Is it that hard to help a fellow human being when he or she is in need? Apparently, yes. There were about 15 bystanders who were staring at the robber and its two victims. No one bothered to lift a finger to call the cops.