What about the parable of the lost sheep, and how the shepard left all the other sheep to find the one that was lost? Who spiritually pays for the murder, when an innoccent person is wrongfully executed. Does the community commit a mortal sin in this instance? Would we not be consistent with the parable of the lost sheep by not executing the 99 to save to 1 that may be wrongfully accused. Recent DNA evidence has more than shown that community murder is possible. If we really trust God's judgement, why can't we wait until judgement day and treat the sinner compassionately in the meantime, and be very careful that we do not commit community murder?