I suppose we have different perspectives, you compare the absolute numbers, I take China's size into consideration. Broken down to a country of Saudi Arabia's size, they'd have some 10000 people in prison, not millions. Nevertheless, I agree with you that their deeds are appalling, though I tend to have some understanding for authoritarianism, even the violent kind.
My problem with the way you paint Libya, Syria and Iraq (there was some overreach, but by and large, they were working with the locals) is that this shifts responsibility away from those that attacked. They removed the state and the stable equilibrium of powers and installed ... nothing. As expected, the territories degenerated into a tribalistic civil war with all kinds of horrible things (which, and how many, of these groups were created/led/funded by the CIA, we'll likely know at some point in the future). ISIS/ISIL are a direct consequence of this policy, and so are slave markets in Libya. Certainly these weren't declared goals, but I don't believe the top officials to be stupid, they were well aware of what happens when you remove the dictator of a country that is only held together by his iron first - especially when they did it over and over, allegedly expecting different results.
> Not saying the US shouldn't address and improve their own record of human rights abuses, and indeed address those that are currently ongoing (such as the detention of immigrants without a trial), but claiming that they have no business criticizing the ongoing, orders of magnitude larger Chinese human rights abuses is going to make the world a worse place.
But this wasn't stated anywhere, was it? The OP said that focusing on China would be a major factor in his voting decision. He was asked whether he'd ignore US abuses. As I tried to clumsily state elsewhere: it's much easier to change your own behavior than that of others, so if it's "I want less abuse in the world" that you want, start with your own and make "end the abuse" the top priority in your decision who to elect into the office of the president and commander in chief of the most powerful offensive military in the world. No Iraq, Libya, Syria and a million or two wouldn't be dead, with many millions more displaced and on the run. My feeling is that China, with all the terrible things they do, still has to stretch a lot to come close to that.