Number 6 - "...I read recently (sorry I cant source it right now) that at the time, even Watchtower may have taken the view that even if they knew 1975 was wrong, the short term gains would far outstrip those who left leading to an overall net gain so it was a risk worth taking..."
Ray Franz said as much in Crisis of Conscience.
Typical Wall Street-style business mindset...
...the membership is a resource first, and flesh-and-blood people a distant second.