In addition, behaviour would radically change once body immortality (short of smashed head) was available. In other words, immortal people would be less likely

In addition, behaviour would radically change once body immortality (short of smashed head) was available. In other words, immortal people would be less likely to base jump, fish beyond Arctic circle, drive without a 5 point seatbelt and helmet, etc. They would use simulators for kicks like these.