There is a fourth point of view expressed by Dan Raviv and Yossi
  Melman. They argue that the Israelis saw the American flag on the ship
  (contrary to most Israeli accounts) but nevertheless the Israelis did
  not knowingly attack an American ship (contrary to the views of the
  LIBERTY men and their partisans):

    Nearly a quarter of a century [after the attack] neither
      the United States nor the Israeli government provided a
      coherent explanation and left the way open for rumors,
      speculation and natural anger felt by many U.S. Navy
      veterans....When they saw the U.S. flag, the Israelis
      thought it was probably the Egyptians pretending to be
      Americans and did not bother to check.