That's true but the number is exceedingly small. 4000 deaths / a couple hundred million is pretty much as good as it's going to get. That's just what happens with really big numbers.
Edit: and that's car accidents, not pedestrian accidents which is also a fraction of that 4k.
Ok multiply it by 10 and it's still ~1000 deaths. 100 / 100 million kids or whatever it is is pretty goddamn safe. You'd need to turn every road into a tunnel with gates to bring that number down.
Edit: and that's car accidents, not pedestrian accidents which is also a fraction of that 4k.