Except in many ways it has, countries united to defeat Hitler, Stalin and the such like. The United Nations may well be a talking shop but it is better to talk than war even if right now China and Russia are doing their level best to initiate a global war, either by directly invading a sovereign state (Russia) or by stealing land and islands and preventing countries from landing on their own territory (China) or by breaking international rules on overflying sovereign nations (China again.)
On another scale, reparations, sharing of medicine and global conferences and laws that have had an impact on climate, on investment and the such like. Sure it is not all perfect and there are a lot of gaps but humans do collaborate and things do get better. Life expectancy? reduction in various illnesses and others.
As for not seeing China as worse or better. It is categorically worse, one party state, mass incarceration of entire regions, concentration camps, people who disagree with the party line, vanishing (anyone want to be a female tennis player in China?), total removal of right to protest (HK) and the destruction of their legal system and way of life.
I totally agree, a world where we act in the best interests of the world is a brilliant goal and people are working towards it and over time we will see significant changes and I like to think overall improvements. But to say that China and the West are equivalent is blinkered and wrong. You protest in China about your water companies polluting your river or the power/chicken farms destroying the environment and you will be shut down and possibly arrested. Certainly your social cohesion score will be impacted and so your ability to work, receive benefits reduced. None of this happens here. In fact the power of protest has forced companies and governments to change.