“You want to keep intelligence separate from policy.”
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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.
The standard rumor at the time was that Rumsfeld, as chief of staff, had persuaded President Ford to appoint George H.W. Bush as director of Central Intelligence, assuming that that got rid of a potential competitor for the presidency.
Republics are created by the virtue, public spirit, and intelligence of the citizens. They fall, when the wise are banished from the public councils, because they dare to be honest, and the profligate are rewarded, because they flatter the people, in order to betray them.
The rare person is still interested in new advances when they are adults. There is possibly a correlation with intelligence. In any case, you have to be fairly bright to keep learning and changing attitudes as you get older.