School starts at home (for many parents, this is an unbelievable idea). I had a classmate who is an anti-vaxxer, even though we did biology together and learned how vaccines worked. My classmate is alright as a person, but I think her environment outside of school made her not one of the sharpest tool in the class and never paid attention to the lessons. My point is that, if the home environment is not conducive to learning, the person is less likely to be intellectually driven. I know there are exceptions and it boils down to "nature versus nurture", but as mentioned already, an environment that does not foster learning makes the person less likely to pursue knowledge.