How about this, a group of people walks into your home, kills members of your family in doing so kill some of their own group. You manage to overpower them, one of the group who lies dying, laughs at you, saying, it is not over, we have planted bombs every where aimed at your loved ones. Bang one goes off killing more family, the rest of the group praise their god for allowing them to murder their enemy,your family. What do you do?
Bit simplistic I admit but pretty much the same scenario terrorist put us in today.