But more seriously, the jury system also has serious flaws. I'd guess its bias towards existing norms. Bias against minorities in the jury pool. And its hard enough for us not accidentally trap into social media echo chambers. I doubt i'd notice attempts to personally manipulate me by a well funded defense (even without FB-like info about me). At the same time, a public defender wont have the resources to even try.
Guess "no free lunch" applies to legal systems as well. So far we haven't found an optimal system, at least.