The very nature of how it functions is unreliable. It's a statistical probabilistic model. It's great for what it was designed to do but imagining that it has any way of rationalising data is purely that, just imagination. Even if let's say we accept that it makes an error rate at the same rate as humans do (if it can even identify an error reliably), there's no accountability in place that ensures that it would check the correctness like a human would.