Minimalist posters explain complex philosophical concepts with basic shapes. Even if we define "feeling better" as a benefit, it does not logically follow that just because one receives this benefit as a consequence of performing a good act, that they performed it in order to obtain that benefit, and not primarily to benefit someone else.
(And even if "feeling better" was a benefit to the person making this sacrifice, it's not a benefit he or she would he able to enjoy for very long, since they will be dead.) Your argument, therefore, assumes a premise that needs to be proved: that people only do good (or anything at all) for their own satisfaction. Gotes.jpg (JPEG Image, 1324 × 1101 pixels) - Scaled (60%) The Nature of Emotions.
Although emotional substrates cannot always be discerned in the behavior of nonhuman animals, many stimuli are experienced by people and animals alike and result in prototypical behavior followed by, generally, the reestablishment of an equilibruim state that might not have been achieved without the impulse precipitated by the inner state. In human experience it is common to use the term “emotion” to describe the feeling state, but in fact emotion is considerably more complex. Complete relationship chart between psychological ("personality")... - StumbleUpon. Complete relationship chart between psychological ("personality") types Chart #1 Key to the chart: Usage: Type A x Type B -> Intertype Relationship.