Chinese people don’t help each other for a variety of reasons. Some of them are the same ones you and I would give when a friend needs our help but we can’t: I’m sick, I don’t have the money, etc. However, there’s a much simpler reason that the Chinese don’t help each other. In classic Chinese culture - IE before the communists took over - it was looked down upon.
Even though the communist party has declared that most of these teachings are not Chinese, there are sayings such as “plow your roof before your neighbor’s” that the rest of the world contributes to the ancient Chinese philosophers.The most well known of these is Confucius, but that’s for another time.
This simply chalks up to a cultural difference.