We are only handing them off to complete strangers because the informal system has been driven underground by laws that only allow the state licensed bureaucratic monopoly. If state licensing was optional and people were allowed to run neighborhood businesses I bet you would see something very different.
I dunno -- it's not like you know people in your neighborhood the way humans used to know members of their tribes. And I've known people in the neighborhood who seemed totally normal and safe, and then got arrested for something shocking. We're not spending all day long with even our next-door neighbors, let alone the ones five blocks away.
Having standards in training, operation, and oversight of childcare seems just as important as safety standards in the food supply. Even though everybody cooks at home, you're not allowed to run a restaurant without certifications and inspections either. And thank goodness.
I'm sorry, America hasn't been Mayberry since the 1950s, and it never will be again. Most of us live in towns with more than just a post office, so this Norman Rockwell-esque fantasy of just dropping your kid off with the nice housewife next door is not just dead, it's starting to smell really bad.