We can stop repressing domestic protestors, so that we won't be the pot calling the kettle black.

Or, if we aren't interested in doing that, contemplate this may be none of our business, just like police brutality at home is none of China's business.

Or, consider it a third way - we as a society are incapable, or unwilling in reigning in police brutality against domestic protestors. What makes you think we are at all capable of bringing such a change to another country, when we can't even do it to our own?