What is the Misfit’s final statement about life?

In "A Good Man is Hard to Find," a 1953 short story by Flannery O'Connor, the Misfit is an ambiguous character and the final scene of the story is deliberately ambiguous, too. The Misfit's actual final comment in the story is to condemn his associate, Bobby Lee, for declaring the shooting of the family as "some fun." The Misfit seems to find this in poor taste and says that it isn't, or should not be, a pleasure to kill others as they have done. However, his final statement about the grandmother in the story is usually interpreted as the moral of the tale. The Misfit tells the grandmother that he wishes he had been alive to see Jesus work his miracles, because then his life would have been easier; he could have known whether to "throw away everything and follow Jesus" or whether enjoying oneself through "meanness" was really the only way to spend one's last moments.
The grandmother then appeals to the Misfit as if he were "one of my own children," and the Misfit tells his companion, after killing her, that she would have been a good woman "if it had been somebody there to shoot her every minute of her life." That is, when held at gunpoint, and in fear of her life, the grandmother expressed humanity, whether genuinely or otherwise, and seemed to care for others. Things became clear for her then. The suggestion is that only when in fear of death do we really understand how to live and how to relate to others.