So if one of the kids walks around and wipes boogers on the other kids, the teacher should say nothing, because it's up to the parents to teach them not to do i

So if one of the kids walks around and wipes boogers on the other kids, the teacher should say nothing, because it's up to the parents to teach them not to do it? Yes, it is the job of the school to require empathy and kindness of students. Whether or not that is what they learn at home, the kids have to act properly in school, and it's up to the school to make sure that happens.