Is child care one of the functions of U.S. public education?
It's not intended to be; however, it is in fact. The fact is children come to school with so many familial, household problems such as abuse, neglect, parental incompetence, and instability that schools are addressed those problems before they can do what they're actually there for, which is to teach.
It has become so.
It’s pretty much all they do. Babysit. No offense to the good teachers out there who do a good job.
If the parents' place of employment can't or won't accommodate the need to pick kids up from school, yes.
Not in the sense of traditional "child care".
Yes by default. They responsible for the care of the children while at school.