When I was visiting Rome I met a fellow tourist who told me that he had stopped a pick-pocket on the train who was trying to lift his wallet. He had cried out and grabbed the thief’s hand. As the train came to a stop, the locals on the train created a human wall and forced the thief out, while at the same time calling for the police. This is how most humans act — cooperatively — most of the time, as this is part of our common social suite.