@brotherdan: you've witnessed an example of "grasping at straws" and attempting to "have your cake and eat it too."
I've heard other JWs use the Nathan/David/temple example you mentioned. But if you take the time to actually read the account, you quickly realize how weak an argument it is. It's at 2 Samuel 7:1-17. The key verse is verse 3 where, after David tells Nathan that he wants to build a temple, Nathan says "Whatever you have in mind, go ahead and do it, for the LORD is with you." Later, beginning in verse 4, God appears to Nathan and tells him why David isn't allowed to build the temple.
Does Nathan ever say that God is going to allow David to build the temple? No. He simply says go ahead and do what you wish and that "the Lord is with you." Compare this to Russell and Rutherford's bombastic proclamations regarding 1914 and 1925 (Russell declaring that 1914 is "God's date and not ours" and that 1914 is "the end of the time of trouble, not the beginning"; and Rutherford's "indisputable conclusion that millions now living will never die"). There's simply no comparison, and when Watchtower followers attempt to draw one, it's just another attempt to grasp at straws.
Also, the Watchtower attempts to "have its cake and eat it too" by seeking all of thebenefits of divine inspiration but none of the accountability. For years, the Society has demanded that its followers hang on its every word, foregoing educational, career, and family opportunities because "The End Is Near." However, when "The End" fails to show up on time, the Society absolves itself of any responsibility by claiming that it's not really an inspired prophet and blaming its followers for reading too much into what was said/written.
This sort of conduct shouldn't surprise us. Just like many other large man-made religious/political/business organizations, the Watchtower plays by its own rules and avoids accountability at all costs.