Its because of capitalism. If the chinese would get back to their communist roots then they would always revolt if something like this happen with them. But because there are no weapons in China allowed, the workers do not get much money to feed themself so they are not strong enough to fight and the government is maybe into this as well its hard at all to revolt. Only if you really believe into communism and make the revolt ready in the underground and in silence and then finally rush out and destroy these capitalistic scum you will win. And also the people in this area may were corrupted with money from the capitalistic company so they would shut up their mouth. The humans always never learn from their mistakes and thats their major problem.