Upbringing is much less important for development than genetics? No. Single mothers who raise kids in poverty with no father figure raise more daughters who have more kids without getting married or even involving a strong father figure (repeating the cycle), and more sons who become criminals or forever doing minimum wage jobs and going nowhere. Parenting > culture > genetics. Your genetic predisposition does not make you who you are. A person who is sheltered and not able to see the world is much worse off than a person who is given perspective about the world and able to expand their library of thoughts.

Which of my opinions do you want me to show are informed by data?