I very much doubt that Rutherford's one and only attempt to ingratiate himself with Hitler had anything to do with Socialism.
While the term "NAZI" is an acronym derived from the words "National Socialist Party", that is where the resemblance ended between Nazism and Socialism! (As others have noted already, the Nazis were a Fascist group. As such, they were every bit enemies of Communists and Socialists as they were of the Western Democracies).
Hitler's response to Rutherford's overtures was to declare war on the JWs; and he, too, from that point onwards never had a kind word to say about Hitler. Der Fuhrer actually loved the Witnesses so much that they even had to wear their own special identity badge - a purple triangle - on their prison uniforms!
Bill.