It's typical human behavior, you have freedom of choice.
What you do with the choices you have, is eventually what type of person you are.
You say that taking MCCodes isn't something anyone cares about? Wrong, take this example for instance; Would you steal a car? It's the same principle, stealing is stealing.
There's a saying in Afrikaans "die deler is net so goed soos die steler", it means that the person using it, is just as guilty as the person who stole it in the first place.
There's actually laws in place for this type of people too, like another example; you withhold information from an investigation, you can land in jail for that alone - some thing as stealing.
I rest my case, stealing is illegal, and everyone starts somewhere, maybe it's just a few "codes" now, but eventually it will lead to store items, cars and then you will have no dignity left.