kenavi:
Since you brought up this specific issue, I'll answer it.
The bombing of USS Liberty was no unfortunate accident. Here are some quotes from some very reliable US military and civilian officials re: the attack on the USS Liberty.
"I was never satisfied with the Israeli explanation. . . . Through diplomatic channels we refused to accept their explanations. I didn't believe them then, and I don't believe them to this day. The attack was outrageous " -- US Secretary of State Dean Rusk
"...the board of inquiry (concluded) that the Israelis knew exactly what they were doing in attacking the Liberty." -- CIA Director Richard Helms
"I can tell you for an absolute certainty (from intercepted communications) that the Israelis knew they were attacking an American ship." -- NSA Deputy Director Oliver Kirby
"That the Liberty could have been mistaken for the Egyptian supply ship El Quseir is unbelievable" -- Special Assistant to the President Clark Clifford, in his report to President Lyndon Johnson
"The highest officials of the [Johnson] administration, including the President, believed it 'inconceivable' that Israel's 'skilled' defense forces could have committed such a gross error." -- Lyndon Johnson's biographer Robert Dallek in Flawed Giant, Oxford
"Never before in the history of the United States Navy has a Navy Board of Inquiry ignored the testimony of American military eyewitnesses and taken, on faith, the word of their attackers. -- Captain Richard F. Kiepfer, Medical Corps, US Navy (retired), USS Liberty Survivor
"The evidence was clear. Both Admiral Kidd and I believed with certainty that this attack...was a deliberate effort to sink an American ship and murder its entire crew.... It was our shared belief. . .that the attack. . .could not possibly have been an accident.... I am certain that the Israeli pilots [and] their superiors. . .were well aware that the ship was American." -- Captain Ward Boston, JAGC, US Navy (retired), senior legal counsel to the US Navy Court of Inquiry
"To suggest that they [the IDF] couldn't identify the ship is ... ridiculous. ... Anybody who could not identify the Liberty could not tell the difference between the White House and the Washington Monument." -- Admiral Thomas Moorer, Chief of Naval Operations and later Chairman, Joint Chiefs of Staff, quoted in The Washington Post, June 15, 1991, p. 14