With respect, these are not theories. What you're asking for is taxpayers to purchase your product. If you're going to ask for taxpayers to buy your product, I think it's a practical question of whether or not it's the taxpayers' business to buy your product. That's not a theoretical issue; it's a very tangible financial one.
I haven't heard you explain why you think taxpayers, and not the industries that use these cars, should be paying the cost.