Bs in school, plays the piano and French Horn, and loves to rollerskate. According to his brother it was because of the stress and attention of the rescue, and the anticlimax of everyday life afterward. US college students see reciprocity as a personal choice. Taking chances in order to help the survival of our genetic relatives is favored by evolution, because their genes are ours, too. According to the kin selection idea, there may be a genetic basis for conflict between different ethnic groups, since evolution pressures us to help only those who can pass on our genes.
Altruism based on kin selection is the enemy of civilization.
If human beings are to a large extent guided to favor their own relatives and tribe, only a limited amount of global harmony is possible. We mutually help and are helped by others, even nonrelatives. In rural areas, people help more than in urban areas. City residents have to tune out stimuli to avoid being overloaded. They may not notice people in need.