Here’s an interesting report on the death rate per million miles by make and model. This is info usually buried because it confirms what common sense might tell you. (I don’t see Smart cars among the worst, but I haven’t looked for a reason):
http://www.iihs.org/iihs/sr/statusreport/article/50/1/1
Skimming the article it looks to have been published before the introduction of the smart car. but it confirms what we know. The smaller the car thd more likely u will die.