The UK Telegraph says that there are about 6,000,000 graduates this year. If I remember correctly China graduates about 600,000 engineers every year. That is a lot of very dangerous people. Engineers know how to do things. There will likely be a point where someone asks a question to a room of how to do something technical and some engineer will say, sure I can do that. And you'll end up with a trebuchet able to launch a Fuel-air explosive package.
If only 1% of these graduates do something that means 60,000 people are doing something. That doesn't count all the other people they have out of work.
Does this mean revolution in China, probably not, but it does mean change.