Their literature of old uncovers everything!! I got addicted to finding out everything of old.
It was drummed into our heads as JW's to look at (and agonize over) the origins of things.
the rejection of so many of the seemingly harmless modern day customs and beliefs, was based solely on where they originated. We were told that it didn't matter that these things morphed over time and became something completely different in our day. (ie: Throwing rice, Kids Birthday parties, Mother's day etc.)
All of that strict logic goes out the window once you point out to a JW the origins of their own flawed doctrines. They excuse these by looking at what they eventually became , rather than seeing that their entire existence was based on false premises that were established by their leaders from the past.