Leolaia really hits the nail on the head.
I cannot say that I think that the GB are deliberate liars, that they have set out to deceive. I certainly don't think that they mis-quote and selectively choose information in the full knowledge that what they are presenting is a lie.
Lady Lee said they are "victims of their own delusions", and I must say that I can think of no better phrase. Here you have a group of men who have been reared on the stories of the organisation being the one true vehicle of God; an organisation that has been attacked mercilessly by Satan, slandered by religious opposers and so forth - and all because of, in the words of the Society, they are "seeking to discern Bible truth." This belief, this persecution and innocence complex is ingrained in these men.
As they have risen through the ranks of the organisation, they have had to face many challenges from without. Every time they have "won" a case at the ECHR, or in the US Supreme Court, their conviction has been bolstered that yes indeed, Jehovah the "God of their forefathers", Rutherford and Russell, is with them. They were taught that it was an irrefutable paradigm that if the organisation survived and grew, Jehovah was guiding them. And as it has indeed survived and prospered, so their conviction has grown.
When we talk about deliberate lying, the organisation don't see it like that. It is the same as the Abraham issue. When you read the WT that talks about Abraham lying about his wife, you notice it never states Abraham lied. Nor does the WT dealing with Rahab. Why? Because it is impossible for these men to conceive that these individuals, ostensibly approved by God, could have knowingly done wrong - so the justification, the whitewashing begins. And so it is with the organisation today. They simply cannot conceive that the approved servants of God, Rutherford, Russell, Knorr and so forth, lied or deceived or did anything with less than pure motives. And so it is presented like that in the WT.
Similarly, the current typical Witness has been raised on this view, and considers the present body to be a group of upstanding men with God's evident approval on them. When the GB say things that you and I would consider to be lies, I don;t think they ever see it like that. They assume that because God doesn't make mistakes, his servants who prophesised about impending Armageddon in 1914, 1925, 1975 and so on, did not do so, because that would mean a mistake was made. So, evidently, the WT writers back then did not mean it like that. And this is what they believe - that everyone who reads the other way has bad motives.
Similarly with the blood issue. They really genuinely believe they are doing God's will. While I'm not advocating belief in God or not, I think what Jesus said (paraphrased) is really spot-on: "There will come a time when they will kill you, and imagine they are rendering a sacred service to God." The GB really do believe they are doing God's will in all matters. They really are trying to be "conscientious Christians." They are doing everything they can to please this image of God they have. And when people think they are doing good.....well, that's when they hurt the most people.
Just like seeking to understand why a rapist commits the crime, does not mean we excuse the crime; so trying to understand why the GB acts like it does, does not mean we excuse their responsibility for their decisions. But I think the ultimate responsibility here lies in human nature - the ability to dogmatise and reinforce our own belief structure, to filter out contrary information, to believe we may even be the sole arbiters of truth. And that, I think, is a failing more pervasive than we like to admit.
PP