These children were not exposed to alternatives until they were old enough to realise that different world views are out there and free for examination by those not shackled by the chains of unquestioning faith in a man made organisation.
And even then they are made to feel that it is "wrong" to read or accept literature from other religions, much less that one is free to examine them and choose. I was an unbaptized publisher as a teen and I still felt very guilty for questioning the JW teachings I had grown up with.