Part of freedom is tolerating other's choices even when you don't agree with them.
Your right to swing your arm ends at my nose, but if I stick my head out trying to get hit, then I bear responsibility.
1) SUVs are extravagant and not very useful.
How is that anyone's business but the owner? I think cable TV is extravagant but I am not trying to outlaw it. Most people don't watch all those channels, in fact, how could they? And don't get me started on very large screen TVs!
2) They pollute more.
Most "Gross Polluters" are not SUVs, they are older, poorly maintained vehicles. Modern vehicles, even SUVs, are not the primary cause of air pollution. Modern vehicles are amazingly clean. A single carbeurated engine is going to pollute more than many more modern vehicles, including SUVs. It is estimated that over half of the pollution is caused by these 10% gross polluters. Much of the remaining pollution is caused by diesal big rigs and busses.
3) They have poor gas milage.
Once again, why do you care? Gas is plentiful and cheap. Perhaps this argument makes sense in regards to entanglements in the Middle East. In that case, the argument is better in places like Europe which import a greater percentage of their oil from the Middle East than the U.S. does.
Also, many of them really aren't as bad as other "high performance" vehicles. Compare the Ford Explorer to a Porche 911 or a BMW Z3, for example. Yet very few people criticize these tiny 2 seaters, even though they have only slightly better milage, yet can carry only two people and almost no cargo!
4) They are dangerous because they flip over.
Even though they do tend to tip more, larger vehicles are still safer overall, at least as we can tell by the available statistics. Driver behavior is probably the most important factor. How else can we explain the fact that the deadliest vehicles are also the ones that perform and handle best?
5) They are dangerous to other drivers.
If you are concerned about that, then lobby to have CAFE standards scrapped. It is estimated that more than 40,000 excess deaths are due to cars getting lighter since the 1970s in the US.
Also, for small cars, over half deaths are due to small car vs. small car accidents or small cars in a single car accident. Only 1% of deaths were due to small cars vs. midsize to large SUVs (in 1997).
So this argument seems to be more emotional than data oriented.
6) They produce more carbon dioxide, thus adding to global warming.
Maybe, but it would be nice to have climate models that actually predict the observations before making policy based on them, IMO.