Ratts came in, lifted the club off the bottom of the ladder... that was his job.
To be fair, his initial job was to not lift them off the bottom of the ladder. He succeeded in that preliminary task, at least.
To problem with prolonged systematic tanking is that it seems to affect the very fibre of the playing group. It hangs around in the psyche and rears its ugly head when the heat is on. That's why we've had fancied sides in Melbourne and Carlton (in recent years) fail to live up to internal and external expectations and yet not seem to give a toss. They've been conditioned to lose without consequence. It's natural now.