I suspect conformity has just as strong of a relationship with childhood environment as genetics. Ironically heavy-handed parents trying to create conformity can create rebels. Loving and understanding parents can create conformists unless they emphasize independent thinking. Personally I try to avoid telling children what exactly to do and try to listen to them, essentially treating them like adults: this is explained in the book "How to Talk so Kids Will Listen".
"Resistance to being told what to think" is given in this essay as working with curiosity, but I think it can also have a negative feedback. The independent thinker can be less curious about ideas they are told by someone else. However, the same phenomenon may help explain the mentioned individualization of curiosity: the ideas the critical thinker thinks of as coming from themselves naturally generate curiosity in those areas.