I'll add my 2¢ worth on this issue. I have always been an auto enthusiast and have spent a majority of my life studying, driving, building, modifying, racing, and just being around all types of motorized vehicles . Of course the whole realization of Peak Oil has prompted me to change my interests to something more sustainable.

That said, I just couldn't leave this thread well-enough alone.
First of all, there are two main designs of SUV: the full frame types (based on pickup trucks) such as the Suburban, Expedition, Yukon, Blazer, Explorer (up till the 04 model), Montero, Trooper, et al.
And the unibody types which are similar (and based on) in design to modern autos: like the Ford Escape, Lexus RX series (Camry), Highlander (Camry), RAV4 (corrola), CRV (civic), MDX (Odyssey/Acccord), BMWs (3 series/5 series), Mercedes, etc. These tend to be lower to the ground and handle more like cars than their full framed brethren due to their car based suspensions.
Full frame SUV's are "safer" than cars only when they collide with a car. Then what gives the SUV the "safety advantage" is its full frame construction which, being a dated design intended for hauling heavy loads and towing, doesn't tend to absorb much energy from impacts. In the case of the truck-based SUV hitting a car, the impact energy is transferred to the car for the most part. Cars, like unibody SUVs have crush zones which are by design, inteneded to absorb the energy from impacts, and to transfer minimal amounts of energy to the passenger compartment. Thus, truck framed SUVS with their high mounted bumpers tend to rip through cars. The occupant of the car in an SUV/car accident is many more times likely to die than the SUV driver for this reason.
When SUVs collide or when one impacts a fixed object, the impact energy is transferred to the occupants of the SUV. Bad in most cases, at least when compared to similar accidents involving a car with the fixed object.
Another inherent disadvantage to SUVs (of which there are many) is their high center of gravity and their antique suspension designs. Modern SUVs have unit body construction and independent suspensions like the cars they're based on.
Full frame SUVs however, differ little in their suspension designs from a 1960's American car. Full frame, solid rear axle and leaf springs.
Combine the high center of gravity and the antiquated design and you have a serious rollover potential. Which is easily observed.
The high bumpers also tend to defeat the side impact protection built into modern cars because the bumpers on most SUVs are level with the side windows on most cars. Bad news for the car occupant, every time.
The car companies are using deceitful marketing practices to turn these behemoths into a status symbol. Not unlike the marketing practices used by Big Tobacco in the 50's. IE promoting a product as beneficial that they know is anything but. Their motivation, like every corporation, is pure profit. The truck based SUV, the most popular type, is also the most profitable vehicle type on the lot of every manufacturer.
That's the bottom line here IMO. The SUV craze is purely marketing hype generated by the Big 3 (and later cashed in on by the Japanese and European mfgrs) to help their sagging bottom lines. The American mfgrs couldn't compete with the imports in the car arena, so they created their own niche in a stroke of marketing genius. Forced the foreign competition to scramble to design their own full sized pickups and SUVs. Now Toyota, Nissan, and even Honda(no pickup yet) are producing SUVs and full sized pickups exclusively for the American market. Even Porsche and BMW make an SUVs (oh the horror!!('8O')) The automotive purist in me gags whenever I see these abominations!
I pray that high fuel prices will ultimately reduce the number of these things on the road, as they pose a danger to everyone driving any type of car, disproportionate to their weight due to their outdated designs.
My own personal observation is that most of these vehicles seem to be driven agressively. I often wonder if "Type A" personalities are attracted to large SUVs so they can intimidate other drivers out of their way. Nary a mile goes by in my daily commute when I look in my rearview mirror and see nothing but headlights and grille from a huge SUV right on my bumper.
Another soccer-mom driving her Suburban as if it was the Accord/Camry she traded for it.
I think SUVs can be safe if they are driven within their limitations. Most SUV owners don't seem to be aware of those and drive far too aggresively in them. I see many going down the interstate here approaching triple digit speeds, following each other less than one carlength apart! 2-second rule? We don't need no steenkin' two seconds rule! Insanity.
Thanks for reading my humble attempt at simplifying this issue.
Roy in blissfully ignorant south Louisiana. Where full sized SUVs and pickups make up at least half the total vehicles on the road.