The fundamental issue in constructing a thesis statement must revert back to what original evidence you have in supporting the point attempting to be made. In short, it might not be as much as what you know as much as what you can prove. Certainly, with some of the events you have identified, you should have evidence that supports a thesis statement such as "Through its actions, Chinese government reflects a greater tendency to demonstration a consolidation and exercise of power as opposed to an articulation of positions of dissent." Another thesis could be that, "The Chinese government thrives on being able to exercise power over political and personal expressions of freedom without any intermediate forces to curtail it." A thesis that supports the idea of the Chinese government demonstrating complete autocratic rule might be accurate.
If these are the points you are going to use, then my thesis would be something like this:
The Chinese government violates the human rights of its citizens in many ways. It is willing to violate the citizens' political rights and it is also willing to violate their personal rights. Personal rights and political rights are the two main kinds of rights that all people have (or should have). Since China is willing to violate both of these kinds of rights, it clearly does not care for the human rights of its citizens.
That's how I would organize the paper -- by breaking the rights up. The Tiananmen massacre showed the government violating political rights, while the other two violate personal rights. Between them, they all show that China will violate any kind of rights -- not just certain ones.