There's a problem with your argument, and silly's got a point.

Every society in the world has people like this, and many people will never go to their aid. It's actually a psychological principle that many people are afraid to help when something wrong is happening (Especially in America, people are afraid of getting sued).

Hundreds of events like these are present in other societies and have been present over the past few decades.

Melamine poisoning and other tainted chinese products are not good examples to explain the "degradation of Chinese society" as well. It's just companies skimping out to make a higher profit margin. Again, this has happened many times in many different societies as well, and has occurred over the past few decades.