Before the Covenant of St. George, there was a good chance that you or your siblings would be eaten by a dragon or calcified by a basilisk on your way home from church. The Covenant leveled the playing field by taking out some of the world's most dangerous monsters, clearing the way for humanity to become the dominant species. Without them, the world would be a very different, very dangerous place.
Before the Covenant of St. George, young cryptids slept content in the knowledge that Mommy and Daddy would be coming home with food for their bellies and fuel for their fires. The Covenant slaughtered innocent cryptids in the guise of "protecting the weak," and left their children to starve, uncomprehending, in a world that was suddenly hard and hostile.
Every story changes, depending on where you're standing when you look at it. Nothing has only one side. And whatever side you're not on, well...that side is probably the wrong one.