I've known a few people who've been in horrific car accidents, including my parents. But even more on motorcycles. Not that my experience is statistically significant and so on but it's something I think about once in a while.
Many years ago I dated (and almost married) a nurse who worked in accident and emergency/casualty. She had a complete aversion to motorcycles resulting from the number of corpses, people having limbs amputated and head injuries from motorbike accidents which were a semi-regular part her work. I must admit her attitude rubbed off on me and I have never had an urge to get a motorbike.