Why does the US government subsidize the car industry?
When you count tax revenue from activities related to car industry - sales, parts, service, worker's paychecks (9.6 million jobs), company revenue, etc., the industry contributes >$110 billion to State and >$126 billion to Federal tax revenue. The auto industry also generates many billions in FDI, R&D expenditure, and contributes to gasoline tax revenue. The State and Federal subsidies given to the auto industry is a fraction of the tax revenue collected.
Even in Singapore, where they have to limit number of cars on the road, the government charges $100,000 (USD) for 10-year COE (certificate to permit car ownership). So the cost of a Toyota Camry is OMV (car) + ARF (license) + COE = $150,000+. Taxes from car license and COE generates $5.4 billion USD or 7% of Singapore's government revenue. Do they give subsidies (rebates) for Vehicle Electrification efforts? Absolutely! Up to $29,600 USD ($40,000 SGD) for a Tesla, because they'll make the money right back in taxes.