I would love to see a lot more SmartCars, Fits and Yarises (Yarii?) being driven around here. They're easy to see over and around, easy to avoid on narrow streets, easy to park next to, don't fill my car with diesel exhaust when I have my window down, and as far as I can tell don't squeal their tires or tempt their drivers to gun the engine at every stop sign.
As someone who used to drive an early 70s sedan deVille and a couple of full-sized 4x4 suvs, I've found a lot to like about bigger automobiles. I've also had a small (2400lb.) Toyota for many years. It won't pull the boat, climb a boulder-filled mountain trail, haul hay, or carry a large family on a long vacation, but for the other 95% of my driving needs, it's really been a much better option. I'm guessing a small car, be it Corolla-small or Smart-small, would satisfy the needs of most. I'm fine with people buying what they want, whether they need it or not, but I'm not going to discourage people from buying small cars just because they might get killed deader in a highway speed head-on collision.
Besides, if Ireland hasn't outlawed them, how dangerous can they be?