Hate to burst your bubble, but there was no "coverup" of the USS Liberty, except on the part of the US not admitting it was a spy ship.
"General Yitzhak Rabin (then IDF Chief of Staff) informed Commander Ernest Carl Castle, the American Naval Attaché in Tel Aviv, that Israel would defend its coast with every means at its disposal, including sinking unidentified ships. Also, he asked the U.S. to keep its ships away from Israel's shore or at least inform Israel of their exact position."
They were told to move. They didn't. The rest is history. There was no fucking "coverup".