In the history lesson given to the reader (and the students) at the beginning of the novel, the Director of the Hatchery explains how BNW arose out of violence and global war (nine years war). The conditioning, anti-family propaganda, and class system are all ways to combat the causes of violence in the natural state of man: namely, competition among equals, the desire to dominate, the desire for glory, and so on. In BNW people are made inequal and content with that inequality, thus escaping the state of nature.
Of course, by escaping the state of nature via social conditioning, the characters in BNW are also giving up their right to free thought, right to self-definition, and right to family life or other close relationships.
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HUXLEY SCIENCE, LIBERTY AND PEACE: "If offered the choice between liberty and security, most people would unhesitatingly choose security."
Huxley's other dystopia, Ape and Essence, depicts another version of the state of nature where mass warfare has led to a destruction of civilization (the Commonwealth).
EVIDENCE: "Chastity means passion, chastity means neurasthenia. And passion and neurasthenic mean instability. And instability means the end of civilization. You can't have a lasting civilization without plenty of pleasant vices." BNW 212