They can't. It's not politically viable. The average American isn't willing to make the sacrifices short term to save down the road. America's left want to try and sell it as something you can just 'bill corporations' to do. It's not how these things work. You pay more taxes and you get those things.

The path in the past was to make cuts to the US military and use that money to fund it. But with relations with Russia flaring up again... that position is also not politically viable.