I think that the author's point in claiming that such killings are technologically implausible is kind of shaky. Better disguises and more intelligent communication channels (select a hotspot in the city at random every time you need to send a message, encrypt the data, and bounce it around the globe for good measure. Hell, you could even use a bot net to do it so the neutral parties were oblivious).

Or you can call it part of the war on terror and blow the individual up with a remote controlled airplane.