The last armies prepared to deal with this conflict were Roman. They would march in, enslave the younger women and adolescent boys and either crucify or put the rest to the sword. Town after town after town. At the height of it's power, one defied Rome or Alexander or Genghis Khan at their own risk and that risk was mortal. Today we respond to suicide bombers with rules that a female interrogator cannot even lie about her menstrual cycle to a detainee. To massive Taliban prison break outs, obviously an inside job, with rules that you cannot desecrate a fake copy of the Koran. I can likely drone on for hours but the secret to cracking terrorist cells, is information it's that simple. Our enemy never even wore 'gloves' and we never bothered to take 'ours' off.
If we're going to fight we need to keep our mission and objectives clear and we fight to win or we should just stay home.