Once a person has joined a political society, why should he act for the common good rather than for his own private good?

Answer: The personal qualities of a good citizen include the following: Honesty - tell the truth. Integrity - be morally upright. Responsibility - be accountable for yourself and your actions.

Explanation: and so that he doesn't get in trouble

Appeals to the common good have also surfaced in discussions of business' social responsibilities, discussions of environmental pollution, discussions of our lack of investment in education, and discussions of the problems of crime and poverty. Everywhere, it seems, social commentators are claiming that our most fundamental social problems grow out of a widespread pursuit of individual interests.