Superchargers only work with Teslas, and Tesla is doing fine when it comes to doubling the number of installations on their own (there are currently 270, and they installed 113 of those last year), so having the government come in and install them doesn't seem like a good use of money.

Further, what's the relevance of Supercharger stations to electrical storage? Maybe I'm missing something but that seems like an irrelevant tangent here.