Sir the systems don't just create rules, they build those rules into the very bones of how the system works. When that happens, the rules stop being optional. They become part of the structure that keeps everything standing. If you try to pull them out, it isn't just the bad rule that disappears: whole chunks of the system collapse with it.
This is what makes some systems feel self-preserving. The parts reinforce one another, so even when people recognize that something is harmful, the cost of removing it is too high for those with the power to make changes. Think of it like a spider web: you can't cut one thread without weakening the whole thing, and the web "defends itself" by making change seem too risky.
It's a bit like the game Nomic, where players can rewrite the rules of the game as part of playing it. Sometimes, though, the rules that get written can trap the players: they make it impossible to change the system without breaking the game itself. In the real world, accidental systems do this all the time. They evolve rules that protect themselves, so any attempt to reform them feels like pulling out a keystone, the cost of fixing the problem looks worse than leaving the problem in place.