Corrected entry: For all the trouble the assassins went through, with 8 weeks detailed surveillance on Lisa, an expensive and incredibly difficult to obtain Javelin missile and such, they picked a surprisingly poor method of attack. It's pretty clear from the technical data of the Javelin missile and the images in the movie (where the effect is exaggerated) that the attack would have a very low probability of actually killing anyone, let alone the entire family as stated. Moreover, the boat the missile was fired from was too large to hide and too small to escape sufficiently far, and the assassins would most likely be caught. As such, the operation was needlessly complicated on many points, yet it worked almost perfectly. Whomever was planning the operation had to be both a genius and an idiot at the same time, which makes it a plot hole.
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Correction: No, it makes it a possibly poor decision. Just because something isn't done the way you feel it should have been done, practically or tactically, does not make it a plot hole. Even your submission allows for probabilities, likelihoods, and possibilities other than what is presented in the movie.
rswarrior