I don't know what Mr. Stein thinks, but if you look at the George Neumayr article, he points out that Nixon's poor behavior is no excuse for his critics to act the same way. If the ends don't justify the means, the ends don't justify the means.
As you are probably aware Stein was in the Nixon Administration as a young economic advisor. He is loyal to his old boss but I contend it is misplaced loyalty.