When people are playing a game, they need to follow the rules. If they don't, the game becomes disorganised and unfair, and it stops being fun. If a student ignores a rules against talking in class,the other student can't concentrate. Driver who don't follow traffic laws can cause serious accident.
Most things we do are governed by rules. These may be unwritten, like the rules of social politeness, or official laws passed by parliament and backed up by the legal system. Punishment for breaking the rules may vary from being criticised to being put in prison. But all rules and laws have the same purpose - to make it clear what most people agree is right or wrong, and what happens if someone breaks the rules. They are disorganised to ensure fairness, safety and respect for other people's right, and in this way they help us work, play and live together peacefully. If there were no rules and everyone was free to do whatever they wanted, most people would probably behave selfishly. We need rules to help us get along together and show respect for each other. Having rules doesn't stop people Breaking them. We will always need referees and penalties, policemen and prisons. But most of us are basically honest, and knowing the rules means that we usually try to follow them. One reason we do this is to avoid punishment, but the strongest argument for following the rules is, quite simply, that it makes the world a better place for all of us.