We measure the success of schools not by the kinds of human beings they promote but by whatever increases in reading scores they chalk up. We have allowed quantitative standards, so central to the adult economic system, to become the principal yardstick for our definition of our children's worth.
My own idea, for what it is worth, is that all sadness which is not either arising from the repentance of a concrete sin and hastening towards concrete amendment or restitution, or else arising from pity and hastening to active assistance, is simply bad; and I think we all sin by needlessly disobeying the apostolic injunction to 'rejoice' as much as by anything else. Humility, after the first shock, is a cheerful virtue.
If you do what you think is right for the benefit of everybody and everything and you make decisions, to go back and regret them afterwards - it's a futile experience and it's not worth thinking about. Because life just unfolds. Provided you do your best and you think you're on the right track, you can only be right or wrong. But to regret it - I don't think there are any huge errors or misdemeanors.