Just as killing of terrorists does not cure us of their menace since terrorism is an idea that needs to be destroyed so also killing of demons on whatever planes does not solve the problem as the obscure consciousness that impels man to do demoniac deeds persists. Now the problem is that consciousness, like energy cannot be destroyed. It can only be changed. Therefore to radically remove evil one will have to convert or transform the consciousness of evil into the consciousness of good. That is what the Supramental consciousness is doing now. As we open ourselves to Its action within ourselves the world will be freed more and more of the Ravans and Mahisasuras for good.
Affectionately
Alok da