Passage Summary: Rhonda thinks you should be charitable because it's personally rewarding, while Brad thinks you should only help people you know so they can return the favor later.

Reasoning: Rhonda argues for helping others because it leads to a more fulfilling life, while Brad argues for helping family because it provides a safety net for oneself.

Analysis: To justify both arguments, we need a principle that focuses on the benefit to the person doing the helping. Rhonda and Brad disagree on who to help, but they both agree that the reason to help is the positive impact it has on the helper's own life or future. It’s a bit cynical, but they both seem to think that 'what's in it for me?' is the best way to decide how to spend your energy. Look for a principle that links the obligation to help with the personal advantage or self-interest of the helper.