Over the decades, America has heard, time and again, that our dependence on oil is a problem both for the environment and national security. Presidents as far back as Dwight Eisenhower have made remarks about weening the country off of oil, but we still haven't come up with the collective cajones to do so. There is a reason for this; us Americans love our cheap energy. It lets us live a lifestyle that is foreign to most of the rest of the world.
Any politician so much as suggesting a gas tax increase can look forward to a thrashing at the next election, and as we know, most politicians are more concerned with keeping their job than making any effective changes to this country. That is why we still have (relatively) cheap gas. David Frum over at CNN put it quite plainly though; if we want to get off of oil, it ain't gonna be easy.