Some people’s answer to everyfuckingthing that involves other people not doing what is expected or desired is to make a rule. Then when they make the rule, and behavior still doesn’t meet expectations or desires, their answer is nothing more than an indignant whine: “But I *told* them what they are supposed to do!!” Fucking morons.
Making a rule and telling people to obey it is pretty much the single least effective way available to get people to do something. The way to get people to do something is to create a system of reinforcers and incentives that make people *want* to do the thing you want them to do.
When the answer of a manager or administrator to a failure of action is, “But I *told* them to do it”, you know you are dealing with a total fucking incompetent.