I agree with you except for when it comes to motorcycles. Motorcycles are 4-5 times more deadly than cars in terms of death rate per vehicle and 30 times more deadly in terms of deaths per miles traveled. (See http://en.wikipedia.org/wiki/Motorcycle_safety#Accident_rates ) Some of that is due to unsafe behavior by riders, but the fact is that a metal cage protects you better than a metal horse. Also, losing tire grip in a car means you slide. Losing grip on a bike means you fall.