Except people are willing and wanting buy them. There is demand for them, and they are filling that demand. That is a reason to make them availiable. No one says that people have to buy an SUV. Individuals make that choice. And proceed to consume far too much fuel.
Oh please. Every time I hear this argument, I wonder about the common sense behind it.
Do you honestly think of the global consequences of every single one of your actions? Do you buy biodegradable or recyclable versions of everything? Do you consider the effects that your purchase will have on the global automotive economy? The effects that that will have on the jobs of workers? How that will affect the numbers of illegal immigrants? (insert other major topical point here)?
Do you think that everyone who has and will buy a car has the time, ability, willingness, and good information to consider all of those every single time they make a purchase?
Probably not.
More likely, they're thinking that "this purchase is going to last me years. If I'm able to sell it, it'll be at a loss. Therefore, I should favor buying something that I really want, even if it means spending a few extra, because changing my mind later on will be far far more expensive (and may not be financially possible)"
Furthermore, not everyone can plonk down $15k+ for an 'environmentally friendly' car. The best way to make them cheaper is to increase the amount of demand. Demand is unlikely to increase while the prices are high (In fact, production may come at a loss). Therefore, the only way for things to get sped along to prevent serious issues if and when there is a gas shortage, is to artificially inflate the demand by either penalizing manufacturers for not producing more fuel efficient cars, or by rewarding them for producing more fuel efficient cars. Both has its merits and downsides.
From what I understand, the reason that other countries have cheap, fuel efficient cars, but the US doesn't, is because of the momentum of the infrastructure. There are few alternative fuel stations, so alternative fuel cars have extremely limited use. Alternative fuel stations can only function as long as they get used. etc etc. It's a nasty little self-sustaining cycle that somebody has to step in and take a risk to make the first move to get anything going.