Probably 30% of the population falls into this category, which of course means that 70% leave the cult when they become adults.
I disagree. I think most leave for emotional reasons, not intellectual ones. A large number are DFed, and the rest leave when they feel dissatisfied for reasons pertaining to their individual life, like wanting someone or something in "the world". True independent thinkers are probably 1-5% of the population and some of those are stuck in the religion too because of family, so there's little correlation between dependent thinkers and Witnesses. Most people do not question what they're taught; they trust in whatever the majority believes. They're just not unfortunate enough to encounter a religion like this one.