This is like trying to prove to someone that the Flying Spaghetti Monster isn't real. Irrational beliefs heed no rational argument.
You /can't/ prove the flying spaghetti monster doesn't exist. That's not irrational, unless you're referring to rationalism in the philosophical sense, ie as opposed to empiricism.
But back on topic, nobody's being irrational (well, on the ARC-170 side anyway), people are making perfectly rational points and the prequel haters simple refuse to accept any rational point that might allow the object of their hate into the game they love. I blame the dark side. I bet you're all Empire players.