When posters like Moving07 and Mat complain about US residents preferring cars to trains for long distance travel, they are implicitly arguing that the US should impose artificially high petrol taxes in order to restrict consumption, and force people to take trains. Of course, petrol taxes are high in Australia as well, and they are world's highest per capita greenhouse gas emitters, but never mind (and no coincidence - Australia is much like the US in most ways). The idea is that society should try to price gasoline so high that it makes car travel unaffordable for most people is certainly a valid argument if you believe that he resulting market distortions and harm to commerce are worth the price. Of course, it is not at all clear that it is, or that it is the government's business to make such choices for its people. In Europe oil has always had a rather high amount of taxes, not because Europeans are fundamentally more environmenally friendly (let's get real about that) but because with the excepiton of Norway and the UK, there is no oil in Western Europe, and governments tend to want to discourage the importantation of anything. These taxes were in place long before environmental concerns were even a consideration. While I believe that taxes on oil should gradually be ramped up in the US, it is only because of I have a rather vague hope that some new technologies might develop that would replace a somewhat scarce resorce, and that the alternative might be more environmentally friendly. To some extent, it reflects my naivety to believe in such things.
But for people like Moving and Mat to label the US as 'immoral' because it does not do so simple arrogance, since it is far from clear that putting a hefty tax on oil, and giving its citizens fewer lifestyle options and a lower standard of living, is the height of arrogance. Republics exist for the benefit of their citizens, and it is up to the citizens to decide what is important, not some rich, disconnected elitist who lives in a city where people hardly ever drive a car anyway.