No laws are or should be concrete. To quote Capt. Picard, " there can be no justice so long as laws are absolute. Even life itself is an exercise in exceptions."

That is not to say rules shouldn't be respected, indeed the harm caused by breaking them should factor into just how extenuating the exception must be for bending them.

Any rule which does no concrete harm except by violating a more held by a specific group is fairly suspect. A really illustrative example would be outlawing the consumptio, for all, of spaghetti if Pastafarians came to power.