This came from a story a fellow lay preacher told in a recent reflection at our parish, and it struck me as a particularly good idea. Of course, this isn't the only thing one should consider, but it's too easily forgotten, so having a special rule for it seems wise to me.
This is far from a uniquely Christian idea, but I think it's a particularly Christian one. I can't think of any other religious story in which the powerless are so consistently brought to the center of the story as in the Christian Gospels. Even with all that emphasis though, we ignore the weak, the poor, the outsiders, and the wounded far too often.