I'm with you on that. An unenforceable, unauthorized judicial decision is still an abomination regardless of whether the intent is good or not.
I don't think it is always unenforceable. Difficult to enforce, of course.
I can't assume the minor wants to disobey the condition. If the minor wants to obey the condition it is enforceable. If the minor is honest with the court, it is enforceable. If the parents use the condition to enforce rules upon the minor, it is enforceable. (eg..you can't see that boy any more).
Just because things are hard to do, doesn't mean we must shy away from doing them.
"An unenforceable, unauthorized judicial decision is still an abomination regardless of whether the intent is good or not."
First, the decision is not unauthorized, it was authorized by the presiding judge. Second, are you saying that, having been told, no sex, if the girl is found to have had sex that action against her is unenforceable? Appears to me she would be charged..probation revoked, etc., thereby making it 'enforceable'