I mean lets not use China as the example here - they are doing it to reduce their air pollution and use the highly subsidized solar pv arrays. They are are the dominant users of coal in concert with solar. They need to ramp up their energy production to match demand and they front-loaded their solar production with massive subsidized capital from the government.

In the case of geo-politics if the US wanted to install solar to cover its energy load it would essentially be a massive payment to China for the solar arrays since there isn't productive capacity in the US. It would also end up being a long term dependent on future purchases of solar from China when they would need to re-up every 30-40 years at end of asset life.

reducing air pollution in the US is good too.

30-40 years of cheap, CO2 free energy sounds pretty good to me.