But let's entertain the idea and say that you get the trial to happen, and your innocent person was found guilty, or vice versa. What do you do with this information? It doesn't help you because you know the outcome already, but in real trials, you don't know, a priori, exactly what happened (unless you were a witness to something, but even then). So a court messed up. What do you do? Real cases don't operate on some outside observer knowing, in advance, what's going to happen. It's why trials are, at best, a good faith attempt at figuring out what happened and dispensing justice appropriately. Everyone just tries, to the best of their ability (ostensibly; I'm ignoring things like biases and such), to piece together the truth, and render an appropriate judgement.