I really hate whenever I try to explain how some bad rules can be abused and immediatelly get someone say shit like "If this happens in your group, change it" as if that would solve the problem. And whenever it is not soemthing you witnessed personally, then it means it never happens and could never happen.
The nirvana fallacy is to substitute a good solution (fix a broken rule or exploit) with a perfect solution that is obviously impossible (create an airtight ruleset), then use that to justify doing nothing.