In his book An Introductory Logic , William J. Kilgore details the most common informal fallacies of logic used in everyday speech, along with examples of those fallacies. This web page tabulates those fallacies and examples for easy application in everyday life.
Human beings require an accurate mental map of reality in order to live and prosper happily.
When an error is made in an argument and the conclusion is widely accepted, only long-term harm to human beings can result. The person has made a honest error in logic 2. The first reason can generally be handled with little fanfare. Simply point out the error in thinking, and guide the person to the correct line of thinking while allowing the person to save face. This sort of disagreement can sometimes be refreshing, allowing new insights and mental connections not previously made.