afzal was not hung because he has not been given fair trail. there was no lawyer appointed to represent him and rowdy lawyers even agitated and did not allow any one to represent him.
definitely it is a case of bullying by majority. since there was not a fair trail in the case of Afzal Guru, Abdul Kalaam did not want to take a chance to hang someone who is not proved guilty yet through proper channel. only some rogue politicians are demanding to hang him and none of them actually interested in giving justice to him...
so Abdul Kalaam being an honest person did not comply with the demand of rowdy politicians nor did he try to appease the majority and become a killer.