Simple they have better things to do then to prove they are right and expose whatever operatives they still have in the field.
One would not need to expose operatives in the field in order to remind Americans about how the left wrote about the growing relationship between Saddam and OBL in the 90's.
Or that Saddam paid AQ terrorists in the 90's. Or that Clinton's Justice Department's federal indictment against Osama bin Laden mentions specifically that Iraq and AQ will work together on weapons development.