Suppose you're an equipment rental service. But you can't delete the customer's account before they return the equipment (or pay for losing it).
Suppose you're a dog kennel. You can't delete the customer's account while you have their dog in your possession.
Suppose you're the parole division of the police department. Can the "customer" delete their "account"?
This is the problem with dictatorial fiat. The world is full of edge cases.