They are liars and they KNOW that. They KNOW that their entire theological structure it was build upon sand. They have no theological foundation for their existence as a religion and as leaders of that religion. They KNOW that their dating system is complete wrong for at least 45 years. They KNOW that 607 B.C does not have any Biblical and historical evidence. But they have created a labyrinth of dates and so called prophecies that have been fulfilled having as foundation 607 B.C. As a result they cannot change those dates, since they are linked to their only excuse that they are "God's mouthpiece"on earth. So if they take way 1914, then there is no 1919(the supposed inspection of Jesus on earth that choose them)and they will have no reason of existence.
They KNOW very well that there is no Armageddon, they just use the fear of the big A to control 7 million people, who think and believe that the GB are God's representatives on earth