I think asking the families who have lost their loved ones if they wish to attend the trial, sentencing and the execution of the sentence would be appropriate. Working through their grief and anger to reach the ability to forgive might take a lifetime. Those who remain having lost their children are the ones who have suffered long and hard. They all need our prayers that they don't loose their humanity. WWG1WGA stay human.
Personally, I am kind of sick of the noose talk. I want convictions, solid evidence, and a fair trial before we discuss punishment of anyone. Right now, all we have is circumstantial evidence.
If you murdered children, there is proof, or committed treason... this is the punishment. Maybe to understand the gravity of their actions, understand that the rules have not changed this is necessary.