There oughta be a special license class for these beasts

Last weekend we made a little getaway to Albany, to take our minds off thing$ and to experience more of our new home state. Over the course of the 3-hour drive up, we witnessed the aftermaths of about half a dozen car accidents - every single one of them involving an SUV rear-ending another vehicle.

I have two theories to explain this persistent characteristic:
1. The worst drivers on our roads can't resist buying the largest "passenger vehicles"
2. SUV drivers have made a collective decision to take out their gas pump frustration on smaller, more fuel efficient vehicles and their penny-pinching owners

Any alternate theories would be appreciated, and will no doubt advance the cause of science.