Because people driving ATVs or dirt bikes around the desert don't kick back a percentage to congressmen.
I am much more willing to support rebates for end user/citizens to help push a technology, but never outright taxpayer handouts and forgivable loans to crony capitalist con artists and financial wheeler dealers as was done with Solyndra. The media covered for those thieves and their political cohorts.
We’d be better off encouraging individual American homeowners to improve their energy self sufficiency and use of their residence footprint with certain types of PV solar than we are creating centralized solar farms that are vulnerable to natural disasters, terrorism and ecological issues.
But as you aptly said what gets funded is always based upon how much the lobbyists pay off our corrupt Congress.
Private capital needs to be put up and used for any large scale development otherwise it always corrupts government and steals from our treasury.