Just to weigh in with my two cents:
1) I liked the picture.
2) Sometimes people react to criticism of others with hostility because they see the same traits in themselves and feel guilty about it. I know I do that sometimes. Your picture comments on ego, yes, but also on driving safety. To those who disagree that it's safer to drive with your hands on the wheel, then I'd be interested to see any safety studies or DOT reports to that effect. [side note: A childhood friend of mine had a deaf brother, and her mother would sometimes drive us home from school. I always felt uncomfortable because she would drive the van with her knees or elbows so she could sign her words as she spoke. At least she had a reasonable reason for driving that way- most people don't. They just don't take vehicle safety very seriously.]
3. Sure, some people need big cars/SUVs/trucks. They have lots of kids or they haul stuff around. In my area, though, most drivers are commuters, driving by themselves to an office job. I once spent a summer day when I was driving around counting all the light trucks that went by to tally how many of them were being used to carry anything in the bed, and only about 10% had any cargo- just a personal observation, nothing remotely scientific about it. I would guess that the rate is much lower for SUVs, but it's harder to see inside them.
4. One of the big reasons I hear from friends and acquaintances about why they drive or would want to drive SUVs has always been 'better safety.' I try to point out that having so many more big cars on the road makes any given accident more dangerous for all drivers (simple physics- the energy released by a collision relates to the momentum of the moving object, which is mv^2, so higher mass = more destructive), and they reply that it might be more destructive for the person they hit, but at least it's safer for them. Aside from the terrible, short-sighted selfishness of this, the claim has been completely debunked. See today's article in the New York Times about vehicle safety.
http://www.nytimes.com/2006/02/03/business/03auto.html
One critical sentence: "A report last month by the National Highway Traffic Safety Administration found that S.U.V.'s also had the highest death rate for their own occupants of any broad class of vehicles."
These are just my reactions to your picture and the responses it provoked, for what they're worth.