Why do we say ACAB? It's because police exist to protect the ruling class of society, and in every western country that class is the capitalist class. In the PRC, it's the working classes. Your thought process is metaphysical, rather than dialectical. By erasing context and insisting on dogmatically applying the conditions of one state to the conditions of an entirely different state, you run into all host of errors.

For example, if I say in the US Empire it is in the people's best interests to overthrow their government and establish socialism, and you were to say the same for the PRC, you would be advocating for the dissolution of the socialist system in the PRC and the likely restoration of capitalism, as it is already socialist. Another example is freedom of speech. I don't support freedom of speech for fascists and capitalists, but I do for the working classes.

When you contextualize and look at phenomena as existing within their necessary interrelations, you move from metaphysics to dialectics, from agnosticism to concrete reality.