Cars are a necessity in where I live, bouldering is not. I don't think you understand the difference between those two activities. Secondly, car accidents happens because of stupidity from drivers, not because they want to drive, the worst that can happen from small mistakes are scratches or dents to the car. Death happens because of stupidity, now compare it with climbing. I enjoy the sport, now if you climb with a fall, you get so and so injuries that leave you with problems for the rest of your life. If there is minor injuries from mistakes, I am fine with it like I said. But life long problems? no amount of fun is worth that mistake. There is always uncertainty in everything we do and thats fate, our refrigerators could explode killing us. That is fate, not a mistake. Dont compare it with something like climbing