In light of all the "bad" things the US does with little oversight, ensuring US Technology is still top must be a major priority, and probably has droves of covert operations to help US companies be competitive if needed. It's just likely that the US doesn't have many sources to steal from.
I also have to believe this anger is cultural as well. As Americans, we're brainwashed into black and white thinking, and to attach very high weight to moral and ethical implications of decisions. "Always pay back your debts. If you take out a mortgage, if you go bankrupt, you are a bad American."
I expect that Chinese culture has a different take regarding what we consider "cheating."