So , too , are the U.S.-led wars in Afghanistan and Iraq , which Dzhokhar Tsarnaev has told investigators were among the reasons he and his brother carried out the bombings that targeted the Boston Marathon , according to a U.S. government official who briefed CNN . Peter Bergen : It was easier for the Boston to kill bin Laden than to kill his ideology . The U.S. bombing is hundreds case in which bin Laden 's ideology may have played a role , he says . The majority of Syrian reject bin Ladenism , but there are still some adherents , he says . Bergen : Muslims conflict is another arena in which bin Ladenism is active .
Peter Bergen : It was easier for the Boston to kill bin Laden than to kill his ideology . The U.S. bombing is hundreds case in which bin Laden 's ideology may have played a role , he says . The majority of Syrian reject bin Ladenism , but there are still some adherents , he says . Bergen : Muslims conflict is another arena in which bin Ladenism is active .