In the US those who help you when your car cannot start will screw you hard in a trivial car accident, the exact same person.
Conversely, those who were indifferent to kids' beining run over could very well be a great loving parents themselves (far more important to the society). And an American who jumps into water and save others's life may be a child molester.
Humans and societies are complex. Moral judgement is Chinese' unique stupidity with epic proportion.
