Its a very debate-able topic. I agree that there are too many unnecessary SUV's in Qatar.
Personally I bought my Nissan Patrol because I do a lot of offroading, and also for towing my Quad bikes that I use on weekends.
You also must remeber that most SUV's can sit upwards of 7 people, which is more than a sedan or other car. For example, the Toyota Prado may not be a very good off road car, but it sits 8 people, the same with the GMC Suburban, except it seats 9.
Also, many people beleive that they are safer in an SUV, which is true most of the time. But this is only because they feel unsafe with the other SUV's on the road, so it's a vicious cycle really!