Usually when people do stuff, we would let them earn trust back. But bad things kept happening. So Dagger made rules about it when people did stuff that made us not trust them.
The only one she lets earn trust back again is Darkside. She says he's earned the right to earn trust back, because he doesn't do stuff on purpose and is always sorry and tries to put everything back better and picks up after everybody else, too. And he doesn't do bad stuff very much, so he doesn't have to earn trust back, because he doesn't lose it.