Excuse me if I seem to speak uncharitably. I would not dream of applying the term to any individual. The other is the assumption that, if one of two specified acts is better than another, it is necessarily a good act in itself. And even then 'we are 'unprofitable servants'. But let me illustrate the two fallacies.
Nothing illustrates a fallacy so well as an extreme case, which fairly comes under it.
Suppose I find two children drowning in a pond. I rush in, and save one of the children, and then walk away, leaving the other to drown. Well, let us take one of those abominations of modern Society, a Charity-Bazaar. Well, if I am really not boring you. We must take these separately.