Let's have a common sense excercise:
Wilson, a civilian, is sent over to African to find out about the yellow cake claims.
He comes back and not only reports that that the story was unfounded but writes op-eds to the New York Times blasting the Bush administration.
Either:
a) Wilson was stupid for not thinking that people would want to find out how the hell he got the job to go to Africa.
His wife was stupid for pulling strings to get him the assignment since inevitably, questions would be raised as to how in the world this guy got this assignment.
c) The CIA was stupid for sending a Bush critic over to Africa on this assignment without thinking that people would ask how he got the job in the first place.
As soon as he started slamming Bush publicly, his wife's career was over. Not as some sort of revenge but basic investigative reporting -- HOW did a Bush critic get such an important assignment in the first place? Answer: His wife, who works at the CIA, set it up.