I was always vaguely familiar with the concept, but when I learned at Gilead that the GB teaches that most major biblical charecters prophetically point to the existence of the 1st 3 Presidents of the WTBTS, that in effect, the entire bible pointed to our time and the existence of JW's, that was it.
I have had zero guilt at all about leaving the faith I inherited by birth. I got to see just how uninspired and run of the mill, how HUMAN, this group really is, close up.
JW's are many things. What they aren't is of God, inspired, or the one true religion. They are a fraud, and sadly, the GB knows this best of all.