Why don't we let 7 year olds be the judges?
On the one hand we have Gingersnaps 7 year old daughter asking this question: "Why do we kill people who kill people to prove that killing people is wrong?".
On the other hand we have Head of Legal blogging the US Supreme Court decision in Baze v Rees on lethal injection. http://www.law.cornell.edu/supct/html/07-5439.ZS.html