Well the stealing thing I think should be looked at with some perspective. China is/was hardly the only country to do so (many in SE Asia and elsewhere) and had been doing it for decades. The fact that they have become so successful seems to have changed matters quite a bit. If we stepped outside of our own preferred position perhaps, how would one see countries such as China then (and so many others) in comparison with the more wealthy and powerful ones? Did they have the power to dictate to others and/or exploit them, or did they rather just have to do whatever they could in response to such? That is how I tend to see such, and after all, much of the globalisation came from the wealthy countries wanting bigger profits - hence the manufacturing where labour was cheapest - rather than there being any beneficent motive behind such.
The space thing I just don't know. It might be that international cooperation would be necessary anyway since some of the possible projects might just be too large for any one country such that it would make sense to join forces - as long as the tensions now existing became less. Trump is hardly doing a great deal in this direction though.
You say we are in the preferred position but China sat back, didn't invent, didn't discover, and now they have easy access to a thousand years of information from western sources and we allow the Chinese to come to the US to attend our universities.
Did China have the power to dictate to others and exploit them? If you are talking about hundreds of years ago, then no, they did not have the power to win against the British but they could have fought a longer war. Everyone fought with other civilizations, some won, some lost. The Chinese tried to isolate themselves but the British wouldn't let them then they were invaded by Japan and eventually realized that they could no longer avoid the rest of the world.
China intervened in the Korean War and fought against UN troops. If they had not done so Korea would be one complete free nation today. Then China invaded Tibet in 1950 and in 2014 they built islands in the South China Sea that are closer to Vietnam than China. China is not as innocent as you think they are.
International cooperation in space won't be needed to build a base on the moon. The US and China can each do it independantly if they wish. Russia can't afford it.
Obama said the right thing then made horrible deals for the US because he wanted other countries to like him. Trump says the wrong thing in public then he makes very good deals for the US people. I'm not a fan of Trump because he's so full of himself but economically he's better for the US than the democrats.