The Book of Revelation that squeezed into the New Testament was only one of a number of Apocalypses written at that time. We are aware of perhaps as many as 10 other Apocalypses, and who knows how many others were destroyed by the successful Pauline Christians.
The Watchtower therefore accepts the decision that was made by the 4th century Christian Church, the same Church that accepted the Trinitarian formula, to accept the Revelation of John as Scripture.
The Apoclypse that made it into the NT is the product of the Jewish section of the Christian movement. It anticipated that the Coming was imminent, during their own lifetime. ("I am coming soon").
It has influenced history ever since, with people in every age using it to show that it refers to their own times. Its failure, whether for the people to whom it was originally addressed or to the people in every subsequent time, has not deterred people from repeating the mistake of saying "Coming Soon".
The lesson that history teaches is that people do not learn the lesson that history teaches.
Doug