Every political and religious movement in history has sought to undermine the family

From How the Mind Works by Steven Pinker.

Every political and religious movement in history has sought to undermine the family. The reasons are obvious. Not only is the family a rival coalition competing for a person’s loyalties, but it is a rival with an unfair advantage: relatives innately care for one another more than comrades do. They bestow nepotistic benefits, forgive the daily frictions that strain other organizations, and stop at nothing to avenge wrongs against a member.