Mill also has no remedy for the inevitable mistakes
Mill's arguments are elegantly rendered, but his points 15-17 notwithstanding, there are far too many cases where the wrong person has been executed (or imprisoned) after being mistakenly - or falsely - accused.
I think it best to error on the side of preventing further tragedy by condemning scapegoats, patsies, or other innocents who just happened to be in the wrong place at the wrong time, who fell afoul of someone powerful, or who are just the victims of mistaken identity.
It is for this reason that the 9th Commandment made the Top 10.
That said, I would like to hear your ideas on what society might due to prevent violent behavior in the first place.
S