You fell into a very common logic hole on that one. The parent comment never said anything about the US, and never attempted to draw a comparison between the US and China. The auto-reflex to assume they were making a comparison, is the logic failure. Criticizing X does not inherently mean one is defending Z; pointing out Z's flaws, does not negate the flaws of X.
And the US government would certainly never cause suffering, at home or abroad!