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If you want to chalk up not buying an SUV to "liberal righteousness" then go ahead. It's just plain reasonable behavior to buy something with affordable gas mileage.
As for your "needs," you don't need to put to bikes in the back of your car. You don't need to haul around a bunch of crap with you. You just do it because you are American and that's what we do. We equate convenience with necessity. No wonder our economy is going down the crapper. Even with a gun to our heads we can't stop buying STUFF.