It is a high duty of citizenship. Jurors also uphold justice among their fellow citizens of America. Think of it this way, Justice is on the shoulders of the jurors, and if youbwere on trial you would want jurors that took it seriously. In this way to think about it, everyone's right to trial is on the willingness to serve your country, to be a part of the American Government system and make a difference.
Hope this helps, have a nice day!