I live on Hawaii island and study the energy issue so i can give some perspective.
First, to dispense with the false choice in the summary: It's not "car charging network" vs. "solar and wind". Of course we need both. Renewables are held back for both political reasons (no carbon penalty, 'avoided cost', slow bureaucracy) and physical reasons (no storage, no renewable baseload except geothermal on this island). There are a _lot_ of important-but-unpopular things the State could do to really make a difference - like tax gasoline and the importation of food - which they will never do because they don't have the guts.
However, we could do every possible thing - give away electric cars, tax the hell out of fossil fuels, put solar and wind and geothermal in every possible place, grow biodiesel crops for liquid fuel, burn biomass for carbon-neutral baseload electricity, wave power, condemn car-dependent suburbs - all of which we should do - and Hawaii would _still_ be a totally unsustainable place. Oil permeates every single bit of our culture, such as our 95% imported food.
Anything short of a mass exodus (not exactly a popular idea) and a return to a semi-agrarian lifestyle (not particular popular either) is not sustainable. Very few people in Hawaii realize it, and of the few educated people, many are in denial or hold out unrealistic optimist for a silver bullet ("fuel from algae will save us!")
For more info, see my biofuel notes