I'm sympathetic with what you're saying, but the thing is, for better or worse, whether they're geniuses or drooling morons, juries get to make this call in our legal system.
I am always reminded of the scene from the Untouchables movie where Al Capone had bought the jury, the Judge finds out, and removes the jury, brings one in from a domestic dispute trial next door, and seats them as Al Capone goes berzerk....