[HangnJudge]

Altruism as well as its cousin, compassion, militate against evolution.

It does make it difficult to establish a mechanism of transmission through survival of the fittest,
if one is acting toward someone else's survival

[lakey]

The scientists suggest that studying the brain systems that allow people to see the world as a series of meaningful interactions may ultimately help further understanding of disorders, such as autism or antisocial behavior, that are characterized by deficits in interpersonal interactions.

Where is the line drawn when it's your in-laws inviting themselves to visit for the umpteenth time? They never show up when there's a problem - they wait until you are finally breathing some fresh air and can relax.