As a US citizen, I try to consider how the rest of the world may view our actions (glass houses and all). Following the logic here it would make sense for the rest of the world to cutoff trade with the United States due to the Iraq war, which has caused many civilian deaths.
But if you agree that the rest of the world should have sanctioned the US for the Iraq war (among other things) then there might be a consistency with trying to sanction China.