It’s not clear what impact the testimony of Sister Helen Prejean will have on the trial of Boston Marathon terrorist Dzhokhar Tsarnaev. The celebrated death penalty opponent was the star witness for the defense in the death penalty phase of the trial of Tsarnaev who has already been convicted for his role in the 2013 attack in which three people were killed and 264 wounded, included 17 who lost limbs. The Catholic nun, who was immortalized in the film Dead Man Walking, claimed that the murderer expressed regret to her for his crime. The defense hopes this will influence the jury to turn down the government’s request that Tsarnaev be executed. But while it is possible to mount a coherent argument against the morality of the death penalty, it is to be hoped that at least in this case, the jury will reject the notion that this sort of ex post facto remorse manufactured for their benefit, ought to be enough to save Tsarnaev from paying the ultimate price for his savage crime.