On Objectivism.
who was Ayn Rand? - a biography, Playboy interview, 1964: "RAND: It begins with the axiom that existence exists, which means that an objective reality exists independent of any perceiver or of the perceiver's emotions, feelings, wishes, hopes or fears. Objectivism holds that reason is man's only means of perceiving reality and his only guide to action. By reason, I mean the faculty which identifies and integrates the material provided by man's senses."

Lots of truth here -- but every individual includes relations to other people, and those relationships have a certain reality, too. Randroids miss the reality of too many interpersonal relationships.