Agreed, with the related note that I think that facts/knowledge can be taught by strangers, but values must be taught by family or another tight community structure (church, respected elders, or similar). Schools can prattle on all they want about delayed gratification and it won’t move the needle in behavior.
I daresay the label of the community is irrelevant, what matters is some other aspect effective ones share - and of course, the child in question (:
A private school with 20 per class and 60 per grade has a fair shot at it. Maybe a small public district could as well, but I’ve never seen it happen there.
Sports teams with strong non-athletic aspects to their program are another possible source of values transmission.
I agree that it’s not the sign on the building that matters, but the content and consistency of what happens inside it.