Robert McNamara is the worst civil servant this country ever had; a mendacious liar, grossly incompetent, a backstabber, a rotten opportunist, a tail-kissing coward who ensured that his own son didn't serve in his disastrously-planned war (that McNamare wrote in his filthy book that "we" are responsible for). One of the truly wretched beings that have been inflicted upon this country.
worst civil servant
I don't think he was a "civil servant," or he would probably still be on the job if he were. Civil servants have civil service protection from dismissal, but Cabinet members can be discharged at will by the President, since the 1887 repeal of the Tenure of Office Act.