Really I should have just said that the rate of injuries in cars is irrelevant to safety considerations with skateboards. If there are dangers in skateboarding

Really I should have just said that the rate of injuries in cars is irrelevant to safety considerations with skateboards. If there are dangers in skateboarding that can be reasonably reduced with better safety, that would be a good thing to do. Likewise with cars. If one is more dangerous than the other, it's not a logical reason to focus solely on that one.