A rich text such as the Gita can live with more than one interpretation. Amartya Sen makes good use of the contrast between Krishna's ethics ("do your duty") and Arjuna's dilemma. Should Arjuna do his duty and fight (and kill many people including people he loved)? Or should he spend the rest of his life in exile (without being responsible for a brutal battle and much killing)? Even if there would not be peace, Arjuna could choose between leading the battle or not.