Which is why the we should all be driving nothing smaller than an excursion, preferably school busses and semitrucks.
No, we should be (as we currently are) free to choose the size car we want to drive. Some people need/want to drive an SUV or a truck, others prefer to drive a minivan, a small car or something different. My wife and I currently have a 2002 Caravan and a 1993 Volvo 940, they both get weigh ~3500#, get 19-25 mpg and cost us less than $4000.
Crash safety is just another thing to keep in mind when looking at a car. When you drive a smaller car you are going to have less of a crumple zone and less mass, smaller crumple zones and less mass mean more of the force of impact is transferred to the people in the car.
If I hit or get hit by another car I dont want my accident report to say "After striking the front of the C class, the Smart went airborne and turned around 450 degrees. This contributed to excessive movement of the dummy during rebound a dramatic indication of the Smart's poor performance but not the only one. There was extensive intrusion into the space around the dummy from head to feet. The instrument panel moved up and toward the dummy. The steering wheel was displaced upward. Multiple measures of injury likelihood, including those on the dummy's head, were poor, as were measures on both legs"
Now, the C class (at least the 2009 C63) weighs #3649 according to
Yahoo, about the same as a Dodge Caravan. So, the same (or close to it) could probably be said for a head-on collision between the Smart Fourto and a Caravan.
As for me and my wife, we will never have a minicar, she was in a very bad accident while in college and now isn't comfortable in a small car.
Aaron Z