Rule #1: The server owner defines what is against the rules as they wish.
Rule #2: Don't disobey the owner of the server.
Rule #3: Be excellent to each other and you will not incur the wrath of the dictatorship that is the owner.
Add those rules and anything you say they're in trouble for doing they're automatically in trouble for doing.
Assuming they're Americans. Remind them that just because they live in America "land of the free" doesn't mean the server is run the same way.
Rule #2: Don't disobey the owner of the server.
Rule #3: Be excellent to each other and you will not incur the wrath of the dictatorship that is the owner.
Add those rules and anything you say they're in trouble for doing they're automatically in trouble for doing.
Assuming they're Americans. Remind them that just because they live in America "land of the free" doesn't mean the server is run the same way.