Your mistake is in making a distinction between diamond 1 and diamond 3. Respawn makes no distinction between predator and high platinum. And it gets worse in pubs. Much, much worse.
As far as Respawn is concerned, you're exactly where you belong. All of us are. And if you're so low on the ladder that Respawn won't give predators free access to you then all those preds have to do is move on to a secondary and the world is once again their oyster.
It's their game. You and I are just here to pad their stats. And are supposed to feel lucky and grateful for the honor. If you're not feeling lucky and honored then there must be something wrong with you. Or so it would seem thinks Respawn.