More fake news.
China was closed from roughly 1950 - 1972. In 1920 they'd just overthrown the last dynasty and were trying to establish a democracy, so, it makes sense they'd be in contact with the US at that time. Unfortunately there were some assassinations and their multi-party system never got off the ground.
There are probably tons of optimistic articles about US-Chinese relationships in the mid-1970s, as well as critical ones.
As it turns out, trade helped boost the economies of both Taiwan and China, and people don't call them the third world anymore. Is it perfect? No. But we still talk to them and do trade.
Rockefeller never advocated genocide. Doing business with or speaking positively of a certain leader doesn't mean you approve of everything they do, nor does speaking negatively mean you disagree with everything they do. What you said above is fake news.