That is not based on real world experience or reality at all. Where did all the elaborate government solutions only people come from on FR?
You are the one not facing reality. Teachers are in the business of building relationships with their students. You might as well tell abused mothers to "buy a gun" to keep their abusive ex-husbands at bay. Sure, some could, but they are the exception, not the rule.
People just don't work the way you envision.