The Pax Americana justice system also use coerced confession as absolute prove of guilt under the excuse that a person will never confess to crimes that they did not commit regardless of the circumstances or level coercion.

You're right about plenty, but not here. If you cut a guy's ear off and he confesses afterwards you're actually going to have a hell of a time getting that confession admitted in court. You very likely won't even get in a confession if a person was not read their Miranda rights.