Sure, there are many arguments for many bad ideas, but the statistics don't lie. A hostile police force, an adversarial legal system, only leads to miscarriages of justice.
It's just an extension of capitalism; if you can get away with it your actions are legitimized regardless of what you did. It's the paradigm of the End justifying the means.
So pur system is designed for miscarriage of justice and so as such cannot be said to result in miscarriages of justice because we do not care about justice in the first place.