My research on this subject and conclusion:
Israeli forces were at that moment engaged in the fourth day of what would soon be called the Six Day War, which would result in a devastating defeat for the combined armies of Egypt, Syria and Jordan.
Although Israel apologized for the accidental attack and paid compensation to its victims, people with ill intent and deflective blame often bring it up like in antisemitic or anti Israel propaganda.
Several of their crewmates were Jewish, so any claim it was not an accident is an insult to intelligence.
The State Department and the White House with the aid of archived materials, show the attack on the Liberty can now be reconstructed virtually minute-by-minute and with remarkable detail. The picture that emerges is not one of single blame, spite, conspiracy, or crime at all, nor even of criminal negligence, but of a string of failed communications, human errors, unfortunate coincidences and equipment failures on both the American and Israeli sides - the kind of tragic, senseless mistake that is all too common in the thick of war. Because of Egypts attacks and it being in the midst of the 6 day war,
Gen. Yitzhak Rabin, informed the U.S. Naval Attaché in Tel Aviv, Cmdr. Ernest Carl Castle, that Israel would defend its coast with every means at its disposal. Unidentified vessels would be sunk, Rabin advised; the United States should either acknowledge its ships in the area or remove them. The U.S.S. Liberty was not supposed to be off the coast of Gaza, The U.S. president and chief of staff and other higher ups, did not even know it was there against where it was supposed to be, nor was Israel notified. Nonetheless, the Americans provided Israel with no information on the Liberty. The United States had also rejected Israel's request, but Anti Israel propaganda can't blame the U.S. as equal blame of the incident, because it loses the intent to bring it up to demonize Israel and get people to join their misery in hate mongering.
( *note-my Zada's own brother and all the crew died in a similar friendly fire on his Ship or sub from a british ship or sub due to communication failures)