Just to clarify, Matthew Poncelet wasn't a real person, but a character combination of 2 killers who were BOTH convicted and sentenced to die for a murder of two teenagers.
I read the User Comments and they react as if Matthew was real. The character is based on a mixture of two killers, Elmo Patrick Sonnier and Robert Lee Willie (who murdered separate people) and the murder itself was based on the one Willie committed. The conflict of both Willie having someone else present and both parties swearing the other did the killing is worked into the story as well.
Prejean's approach is unique in that she not only is ministering to the convicts as they wait for their death and aiding them in taking responsibility for their actions, she also reaches out to the victims' families, to help them know that the convict did, indeed feel remorse for what they did-effectively aiding both parties.
Everyone posting here seems to have strong beliefs on the Death Sentence. It's not my place to say it's right or wrong-in theory punishing death with death makes some sort of Karmic sense, however denying a person their freedom for the rest of their days, although costly, makes more sense to me-being stuck in a small room 23/7 (with one hour of exercise)for the rest of their days to be reminded of the cruel thing they did seem a more apt punishment-they are technically alive, but denied living. Say someone killed someone so they could get out of the responsibility the person they killed required (like Susan Smith killing her poor kids by shoving her car into a lake). I find it fittingly ironic that they would not get that "freedom" they craved and would now have to spend the rest of their days imprisoned.
Prejean's point comes through the story very well. She has my respect-she manages to find that balance-she isn't supporting a killer, she is guiding them to accepting what they did. If they didn't feel some kind of remorse, they wouldn't be asking for spiritual guidance.
Ona final note, when Poncelet apologizes to Delacroix parent for killing his son, the parents of the girl who was also murdered mutters something about why he didn't apologize for her death. I think the point was that throughout the movie, Poncelet denies killing both kids. There is doubt in Prejean's mind he did both killings-there is a friend who was sentenced but not to death-my thought is that Poncelet killed the Delacroix boy and the other man murdered the girl-hence Poncelet was taking responsibility for what he did. Had he been responsible for the girl's death, he probably would have apologized for that as well.