Does the 'rule of law' exist if there is no one to enforce it?

Some schools are now threatening to suspend students who do not stand for the pledge or the anthem. This has already been tried by the supreme court and found unconstitutional (West Virginia State BOE v Barnette). But it doesn't matter if the state police won't enforce the court's ruling. If our very president doesn't stand up for the rights of the people over the ego of the state, then the rule of law is meaningless.