The behavior of Chinese government security forces on the streets of the U.S. and other free countries should have been enough, but now they're doing it at sober indoor functions. OpenNet Iniative Asia is a forum to promote freedom of expression, particularly online, and recently took place in Sharm, Egypt. There was a poster about China's Great Firewall, and in response to pressure from Chinese authorties, the organizers caved and did the predictable thing - and it's all on video. This just happened last month.
I typically accept that the Chinese government is rational enough not to want to take over the world, but actions like this make this more difficult to believe.