The problem is that rollovers are even more dangerous in an SUV than in a ``regular'' car because the center of gravity is so much lower. This means that when a rollover occurs, the center of gravity is much higher, which means that the cabin gets driven into the ground with a much greater force than in a ``regular'' car, causing much greater upper-body injuries.

No one (except Evel Kneivel, et al.) intend to flip their cars. Yet it still occurs.

Of course, this is not to say that the NHSTA's methods are perfect, but, still, any increased chance of rollover is that much more chance of death or severe head injury.