What quality does a kid need to have in order to remain free of the indotrination?
I grew up in the org. My parents were - and still are - 150% JW. My dad beeing elder and my mum out in field service all the time. How I broke free:
1.
I have always been reading. I learned to read even before I went to school. I read all kind of books, sure enough at least half of all books at our local library.
2.
When I turned 11 or 12 I was curious about other religions. Not because I was in doubt about the one I had but because I have a natural interest in all kind of things. My parents strongly discouraged me - in words and also by taking the rented books from my room while I was at school - but I didn't give up reading, instead I started reading in the library building.
3.
At about the same time I watched a woman leaving who had entered the org 2 or 3 years prior. She ended up beeing df'ed and treated very bad. What disturbed me about that was that this woman was in fact a true angel. She had a heart of gold! But the people at the KH treated her like she was the worst person on the planet when in fact she was one with a warm heart and an always peaceful attitude.
To sum this up:
I fed my brain from an early time in my life, all the brain food made me thinking a lot which made me an independent thinker, I have always been curious and open to all kinds of things, I always had a strong will (that's in my genes I suppose), and I always hated it when people were unkind towards each other.
So that was all it needed. I made my decision and then went straight to my parents and told them I wouldn't get into their footsteps. I just walked out of it and never turned around again to look back. I was strangely unimpressed by then.
I also remember asking my parents during that conversation, why they needed a whole hour or so to prepare for the wt study (reading, underlining, reading, underlining,...) while I was able to do the same within say 5 minutes and anyway be able to give answers in my own words. I remember thinking the whole thing was for stupid people only. I even told my parents so point blank knowing that my parents were actually quite intelligent folks. But watching their reaction I realised they were absolutely brainwashed.