From any perspective
Maybe from my parents perspective who accepted the 'truth' in the late 1950's. The evidence of the preaching work and the cry of here is the Bridegroom and the fulfilling of the ten virgins parable as part of the 'sign' with the growth of the organization and preaching work on a worldwide scale lead them to accept 1914 as the end of the Gentile times and in so doing accepting the calculation irrespective of whether it made sense from an historians viewpoint.