> The US created biofuel subsidies a few years ago
A few years ago? Corn ethanol subsidies have been a thing for my entire life.
It's a net-negative fuel. Costs more fuel to produce than it provides. It's literally just a way to waste water, farmland, huge quantities of diesel (burned by engines exempt from any sort of emissions), labor, etc.
What changed is that ethanol has been forced by regulations into more and more use over time. That has driven up demand for corn, and one of the worse side effects is that a major food staple for Mexico has gone up dramatically in price.
> effectively become a wealth transfer to support poor rural American communities,
If you think that's bad, stop and think for a moment about what purpose the US military serves for rural America, both directly through personnel but also indirectly through all the incredibly wasteful equipment, service, and supply contracts.
The US military's primary reason for existence is force projection, but its secondary is keeping rural American's uneployment from skyrocketing.