I don't think that follows. One can maximally prioritize children while also believing that all children are better served by a society that protects liberty ov

I don't think that follows. One can maximally prioritize children while also believing that all children are better served by a society that protects liberty over immediate safety. How you weigh these issues turns on how you weigh the N-th order effects. It's probably not too controversial to say that eliminating all cars would harm children more and thus children as a whole benefit more from cars than their elimination. But it would be disingenuous to characterize this calculation as caring more about economic benefit than children.