You have asked a good question, one that bothers me too.
Someone posted that sincerity doesn't make them right, which I totally agree with. The real question is though, are they even sincere?
The following is a verse from John: (John 11:45-53) 45 Therefore many of the Jews that had come to Mary and that beheld what he did put faith in him; 46 but some of them went off to the Pharisees and told them the things Jesus did. 47 Consequently the chief priests and the Pharisees gathered the San´he·drin together and began to say: "What are we to do, because this man performs many signs? 48 If we let him alone this way, they will all put faith in him, and the Romans will come and take away both our place and our nation." 49 But a certain one of them, Ca´ia·phas, who was high priest that year, said to them: "YOU do not know anything at all, 50 and YOU do not reason out that it is to YOUR benefit for one man to die in behalf of the people and not for the whole nation to be destroyed." 51 This, though, he did not say of his own originality; but because he was high priest that year, he prophesied that Jesus was destined to die for the nation, 52 and not for the nation only, but in order that the children of God who are scattered about he might also gather together in one. 53Therefore from that day on they took counsel to kill him.
I don't think it is a very big leap to put the governing body at the same level as the Jewish Priests, after all, they are the ones that claim to be the 'spiritual Israel'.
In my opinion, they know they are sinning. They know they are wrong. They had to learn that as they came up through the ranks. However to admit responsibility and wrongness, they would have to give up both their place (our betters, our leaders, the object of devotion of many if not all of JW dom,) and the "nation' that is, they would have to let 6 million people off the hook. They just can't do it.
Thats my take and I'm sticking to it.
Brant