I think it's a little deterministic to look at it this way. Genetics determines very few things about a person's personality. It can set the boundaries - give you a predisposition to certain things like anxiety or empathy - but almost all of personality development happens in the interaction between your biology/genetics and your environment, or more properly, your response to your environment, which is to some extent guided by your genetics but also has huge cognitive and emotional components that are unique to the situation and to the individual's perspective. Look at identical twins - exact same genes, exact same environment, yet most develop very distinct personalities. It's not an either/or proposition - it's a both/and one.
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"If ten million people believe a foolish thing, it is still a foolish thing."
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