I think part of it is that the JWs are screwed-up with regard to the Bible in the first place.
They teach that you have to study the Bible to learn the truth about God…like it all comes down to reading some “manual, because there’s gonna be a test later” or something.
I like your example of the car. I think if someone were to write a biography of me, they couldn’t get everything about me in that book…yet that’s what the JWs try to make us believe about the Bible.
The Witnesses “control” God in a way, I believe, by making God something you can learn everything about and no his mind on everything by reading his book. If you keep trying to find God in a book, you’ll never find him. He’s not just there. You only get a part of the picture.
If God is really a spirit, someone mystical and beyond us, you have to have some mystical experience of some sort like most other religions do. The Witnesses don’t; they consider it all demonic. That might, and only stress MIGHT, be one factor for some to think it was all hogwash.
But you can’t compartmentalize people who decide they cannot believe in God or don’t want to or feel there is no proof or reason to after leaving the JWs. They’ve all got their own story to tell, and I am sure they’ve all used their minds to come to the conclusions they have…maybe for the first time since being in the Watchtower where, as you know, using our minds to think for ourselves was anathema.
Each person is an individual with a thinking mind, feelings, wisdom, and other deep aspects to them, too deep to fully describe here. We leave the Watchtower and we all start at one place and arrive…the best our minds and consciences and hearts can do…to some other place. I am now something I never thought in a million years I would ever be upon leaving the JWs, a Roman Catholic. Whether it’s an atheist or Catholic or whatever, at least we’re all free to follow the best way we feel we can.