You can't wake up one day and say 'I'm for gay marriage ' and wake up the next day and say 'I'm against it.' Wake up one day and say 'I'm pro-choice ' and the next day wake up and say 'I'm pro-life.' There's no credibility there.
Another factor is the decision made in 1976 to sharply divide the FBI and the foreign intelligence agencies. The FBI would collect within the United States the foreign intelligence agencies would collect overseas.
