What examples can illustrate that Chinese people "have no small etiquette but great righteousness"?

Many examples can prove it. For example, there was an incident on the Internet. Comments on it often said how the Northeastern people were doing, and how the Shanghai people were doing. This would then cause regional conflicts in the comment area, making people who didn’t know what they were talking about. Some people think that the Chinese people are particularly ununited, but when it comes to major events, the Chinese people are surprisingly united. After the Wenchuan earthquake, people across the country immediately took action, donating money, materials, efforts, and support.

I think this is the Chinese people's "no small courtesy but great justice"