People definition's of good will vary. A strict Muslim and a gay man will probably have quite different interpretations of "good". ISIS probably believe they ar

People definition's of good will vary. A strict Muslim and a gay man will probably have quite different interpretations of "good". ISIS probably believe they are acting in a "good" way, it's the strictest interpretation of the word of god after all. Trying not to do harm would be an easier goal to define.