The "system" we've collectively developed forces blank slate souls to develop and play out our learned behavior in order to survive, or feel like we're surviving, in the world. But, as the article explains, we do not (typically) inherently hold, are not born with, nor do genetics code for, these "dark" or "light" traits. Therefore the emergence of "dark" or "light" tendencies is really more decided by the family, community, and economic systems. It is not that a "dark" or "light" trait necessarily allows a person more to succeed, but it suggests that some family, community, and economic systems require a person to develop what we would label "dark" or "light" traits from our perspective in order to survive. It appears the point of the article is: when we come across a person with "dark" traits, it is not entirely THEIR fault they have "dark" traits, it is more OUR fault we cannot shape our family, community, and economic systems to produce people with "light" traits.