Six decades after the attack in Dallas that claimed President John F. Kennedy’s life — and killed his evolving policy of winding down the nuclear arms race and Cold War conflicts in Cuba and Vietnam — J.F.K.’s assassination still matters. Some lament the continuing influence of “conspiracy theorists.” Others point to abundant evidence of high-level malfeasance in J.F.K.’s assassination. The very night of the assassination, Lee Harvey Oswald told reporters that he was “just a patsy” while being walked down the hallway of the Dallas Police headquarters. Oswald was then murdered in police custody two days later, before he could explain himself further. If you believe the sworn statements of the CIA, the US intelligence service knew very little about the man who supposedly killed President Kennedy on November 22, 1963. As director John McCone told the Warren Commission in closed-door testimony in May 1964: We had knowledge of him, of course, because of his having gone to the Soviet Union, …