If you're innocent, by the time you get to pleading, the system has already proven to you that it doesn't work. Even assuming no misbehavior (e.g. planted evide

If you're innocent, by the time you get to pleading, the system has already proven to you that it doesn't work. Even assuming no misbehavior (e.g. planted evidence), the police found you guilty enough to investigate, a judge found you guilty enough to arrest, and a prosecutor found you guilty enough to charge. Why would you gamble and dare think the trial in such a system would work any better?