Of all Kissinger's crimes, bringing in the CCP (emphatically: not the Chinese state, rather the awful CCP govt) out from the cold was easily the worst, and possibly the biggest blunder in human history.
It legitimised and empowered the communist govt, subjecting the Chinese people to an indefinite future of oppression and the world to its whims, the extent of which we are still yet to see play out.
Communism is an evil that needs to be shunned, not embraced, and sadly (and rather ironically) money is why people turn a blind eye to what the CCP are now.
If Nixon/Kissinger had not done so, that govt would have eventually been overcome and both China and the world would have a far far brighter future. Alas.