Aggregating for lifetime character (and well-being): is there an end-of-life bias?

Newman, Lockhart, and Keil recently published their finding that when judging a person’s overall moral goodness or badness across a lifetime, we seem biased toward the end of life (at Cognition here).  According to this theory, we do not judge the moral qualities of a person’s lifetime character by merely adding up the ‘moral points’ of her individual actions over that life.  Instead, if Scrooge or Andrew Carnegie turns things around at the end of their lives, we will attribute much greater goodness to them across their whole lives because we give greater consideration to what people do at the end of their lives than we give to the rest of their lives, when determining the moral character of a life.  I think that the data presented by Newman et al. are open to at least two other explanations, however.