I think part of the trouble comes with cherry picking proof texts instead of trying to do the hard work of trying to reconcile all the things the Bible says on a topic.
Throughout its history, the WT leadership seems to figure out what they want to believe first and then hunt through the Bible to find some text they can use to support them.
Of course, we all are prone to do that, but the WT are masters at that type of proof texting.
Think of how often the literature cites passages which, in context, have nothing whatever to do with the point they are advancing.
That's much easier than examining all the related passages and trying to see how one might limit or explain the other.