Basketball & endogeneity

Basketball is very important here in Kentucky. While at the mall today, on the back of a guy's hoodie today I saw the slogan "Basketball doesn't build character. It reflects it!" So this guy, or the person who designed his apparel, had a strong awareness of how unobserved heterogeneity can lead to misleading inferences about causal relationships. I thought about congratulating him on this, perhaps inviting him to reflect on Pearl's recent work on causality, but thought better of it. Nonetheless, he is way ahead of many more educated people. Go Wildcats!