Why do groups have rules?

Answer 1

Groups of people need rules and laws to set behavioral expectations, and warn folks what is prohibited and punished.

Answer 2

Groups have rules because if there were no rules people would be treated unequally and it wouldn't be fair to those people who actually put in effort.

Answer 3

Because people generally won't behave themselves if left to their own devices.

Answer 4

Society needs rules to prevent anarchy. Rules protect the general well-being of society. Without rules, people would do as they please, often endangering themselves and others.