There is a balance in almost anything at the scale of hundreds of millions of people. People die in all kinds of ways. Some drown, but we still build pools. Some die on trampolines, but we still install those. Some die in the tub/shower, but we still clean ourselves.
I don't see any reason to think that there isn't any possible nuance on the balance between freedom to move as a kid and the danger of stranger violence. (I have two kids who aren't yet teens. The concept scares me, but I also let them swim, play on trampolines, ride in cars/airplanes, bathe, etc.)
No because he does not mention the denominator and is thus free to increase it ;)
Same as there is a >0 number of car crash deaths with optimal policy. And a >0 amount of rat droppings in our food.
And in your personal life, a >0 chance of dying of avoidable accident.