The big unstated assumption in your position is that getting trouble for letting one's kid unsupervised in the streets is unlikely given that one actually lets

The big unstated assumption in your position is that getting trouble for letting one's kid unsupervised in the streets is unlikely given that one actually lets their kids unsupervised in the streets. In could be true, but another plausible alternative is that it's rare to get in trouble that way because no one is letting their kids unsupervised in the streets. An analogy: death by actively jumping off a plane without a parachute, if it exists, is extremely rare. Doesn't make it safe.