Fly Me To The Moon (One Day Maybe)

I had always assumed that by now we would have at least a moon base but it seems we have just given up since 1972 and apart from a few landers, the Moon has been free of humans bouncing all over it although there have been tenuous mentions of one of the big three, USA, China and Russia doing something but none have any firm plans which is disappointing.
The Chinese and Russians have announced a joint plan to build a base by 2035 and the Chang'e 7 lunar mission is planned to launch around 2024 and will survey the moon for a prime piece of Lunar real estate to build it but my hopes were on NASA who said a while back that their Artemis program planned to return humans to the Moon by 2025.
That has now been put back to at least 2028 due to a cock-up with the launch tower needed to launch the crewed missions to the lunar surface as the company already paid $16.8 million to build it at the Kennedy Space Center have announced the $16.8 doesn't quite cover it after-all and will need NASA to throw a few more tens of millions their way in order to complete it.
I don't know why America, Russia, China and the European Space Agency don't pool their resources and do it as a joint effort for mankind rather than try and do it alone, national machismo i guess, but it leaves me banging my head on my desk in frustration that we could do so much more in everything, not just space flight, if we put aside our differences and just did things together.