The Chinese government likes to engage in propaganda in order to keep the population in line. Here are some example of a long-running propaganda campaign in my city:
Protect the environment
These signs are all over the place in my city. All these photos were taken within about 1km of my home. I'm not really sure how this kind of campaign would work in other countries, but it seems that this is what the local government wants to use for social conditioning. "Nefarious" stuff.