The US government does subsidize EVs (it's the only reason Tesla can exist, for instance), the problem is that all their subsidies just get used for stock buybacks. Why would a privately-owned company actually create more factories? That's just not profitable.

The most rational system.

The government does subsidize EVs.

Additionally even used EVs are subsidized.

Between federal and state tax credits, as well as utility company rebates, my folks just got over 5k back for a used Nissan leaf. They were able to trade in their old clunker, netting a profit of a few hundred dollars to upgrade to a practical used EV.