I'd have to go back and get the details again, but note I said the "physics" were impossible, not the occurrence. Sure, there have been missiles fired by mistake, at both military and civilian targets, but the physics of it, IE the exact circumstances made these things impossible. The lady that claims to have seen a missile streak up was on the opposite side of the island or looking in the opposite direction/blocked and so on. This is what makes it such a good case study. Eyewitnesses are both the best and worst resources we have for investigating accidents. I even remember one of the conspiracies, and people believed this as well, was that it was a MANPAD type weapon, despite the huge difference in those and a ship-fired SAM missile.