This is an interesting comparison, but I think it unfairly favours rockets because you seem to be calculating chance of fatality of each passenger/driver.
Typically astronauts will have less than 10 flights, whereas a driver could have 10,000 trips in a car.
Typically you won't be driving (or riding in) a car for up to a year non-stop (without so much as a fuel stop), either; I feel like that offsets the quantity of trips to at least some extent.
Typically astronauts will have less than 10 flights, whereas a driver could have 10,000 trips in a car.