Wow, a toughy. I don't care for Lettermen enough to care what happens to him, but at the same time I have zero tolerance for Jihadi scum no matter where they are threatening our citizens, no matter how worthless that citizen may be. Am I good if I let the Musslim scum act first and then snuff the Musslim scum?
(I know, I am reaching hard to find a win-win...)