Not saying everyone who has been banned deserved it (maybe they did, maybe they didn't..who knows!), but people do have a tendency to lie when they get caught and punished for misdoings.

Fun story. A coworker of mine got fired for stealing a good chunk of money from the company. When she was leaving, she told everyone that she was let go due to a lack of work. A few of her office friends were pissed at the manager until the real story came out.