Mossad, unlike the Clowns in America, are a top notch intelligence service. Also unlike our Clowns, they're not at all afraid to take the gloves off and get their hands filthy dirty when it comes to what they perceive as protecting their existence.
You might find some people around here (and everywhere) disagreeing that the CIA's hands are clean. Try the Iran/Contra scandal for one.
Sorry for the ambiguity, by "here" I meant GAW