Cofty I think none of us know ourselves very well.
Like I said above, I have been reading books about what influences us and why we make decisions and I find many of the arguments compelling. Two major reasons we do things are 1) we perceive others making a certain choice and figure that it must therefore be a good choice to make and 2) we follow what are (or appear to be) authoritative instructions. These influences account for most of the decisions we make in life big and small. Yet when we explain our decisions to ourselves we explain them in terms of rational choices and logical arguments. This is not a crackpot theory about human decision making, from what I can gather this is a mainstream consensus in psychology about decision making. As someone who respects expert opinion and academic consensus you could maybe look into it if you are interested. In particular the work Robert Cialdini.
And I think it's a bit incredible to claim to have left JWs and joined a mainstream alternative without any outside influence. If outside influence played no part whatever, why didn't your search for the truth lead to Lutheranism, or the Orthodox Church, or even Jainism, or whatever else? Why did it just happen to lead you to join a church belonging to the dominant Protestant faith in your country? There was no influence from anyone around at all? None? It's an amazing coincidence that a pure search for truth just happens to lead to the church down the road.
Like Dawkins says, children of Anglicans, in normal circumstances, grow up to be Anglicans. It's an accident of birth. We are influenced by the people around us, ex-JWs are no exception.
Was there no friend, no workmate, no family member, no person on the bus, in the gym, or at the local shop, who said anything to you to indicate that leaving JWs might be a good idea and that there was a better alternative that others have chosen? I had many such interactions during my short time as a JW. It's hard for me to tell which were most significant, but they all surely played some part.