Heh, if you plead guilty does that mean the jury should be made of convicts?
but to the actual topic, "jury of your peers" is a legal term and not a logical term. It just means the people should live near you [1]. and not that if the town is say 99% black that the jury has any black members.
See also, does a "loaded gun" need to have any bullets in it (NO!) [2] [3].
What part of a "jury of your peers" do these prosecutors not understand?