In my opinion if a foreign person kills our president I don�t see why we would punish the country unless the assassin was from a terrorist group that the country was housing or supporting. If the assassin was on his own and the country didn�t have anything to do with it and it was not housing a terrorist group then I would only want the assassin punished. But then again, we did punish the country and the assassins from 9/11. Maybe you could punish the country to a certain extent just because the assassin was from the country but nothing like you would punish the assassin.