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The ingroup knows the rules well enough that they can wait until an enemy crosses one of the rules, then they have an excuse to punish them. The more rules on the books, the more opportunities to use them against your enemies.
When someone inside breaks the rules, it’s treated as a misstep, handled internally, and then forgiven after a short ceremony to make it look like order and procedure are still being maintained.
At clubs. At school. At work.
This is one of the first things I taught my kids to recognize and yet I see plenty of people in their 40s or more that still haven't figured it out. Some of them even become "useful fools" and make matters worse.
This is why Codes of Conducts became so popular.