"Why bother quoting anything pre-Rutherford since the Society has disavowed any of Russell's writings??"
They haven’t disavowed them entirely, i.e. end of the Gentile Times in 1914. But even if they had disavowed them all, they still try to cover up Russell’s mistakes with deliberately misleading statements that amount to little short of lies. Just a sample of examples where they try to make it appear that Russell taught what JWs teach today;
Awake! January 22, 1973, page 8 - “Jehovah's witnesses pointed to the year 1914, decades in advance, as marking the start of "the conclusion of the system of things."” (decades in advance JWs said 1914 was the end of the time of the end not the start of it).
Revelation its Grand Climax is at Hand (2006) 105 - “Charles Taze Russell and his fellow Bible students realized decades earlier that 1914 would mark the end of the Gentile Times … While they did not in those early days fully understand what this would mean, they were convinced that 1914 was going to be a pivotal date in world history, and they were right.” (Russell thought 1914 would be a hell of lot more than pivotal, and he did fully understand it, he just got it all wrong)
What Does the Bible Really Teach? (2005), pages 84-85 - “When Jesus told his followers to pray, "Let your kingdom come," it was clear that the Kingdom had not come at that time. … There was a waiting period. … During the 19th and 20th centuries, sincere Bible students progressively discerned that the waiting period would end in 1914. World events that began in 1914 confirm that the understanding of these sincere Bible students was correct.” (19 th and early 20 th century Bible students believed the waiting period ended in 1878).