Why must we burn Sade, and his sadisr/maasochistci evangelising

Centering his life in the erotic, Sade missed the truth of the erotic. This truth, Simone de Beauvoir Beauvoir 

tells us, can only be found by those who abandon themselves to the risks of emotional intoxication. Living this intoxication we discover the ways that the body turned flesh dissolves all arguments against the immediacy of our bonds with each other and grounds an ethic of the appeal, risk and mutual vulnerability.

Once she abandons the idea that our freedom, as absolutely internal, is immune from an assault by the other, and accepts the radical vulnerability of our lived embodiment, questions of violence and desire cannot be severed from the question of our shared humanity or questions of ethics and justice.

 In condemning Sade for his perversion of the erotic, Beauvoir also faults him as an artist. Though she accuses him of being a technically poor writer, the heart of her criticism is ethical not aesthetic. Sade, according to Beauvoir, violated his obligations as an author. Instead of revealing the world to us in its promise and possibilities, and instead of appealing to us to work for justice, he took refuge in the imaginary and developed metaphysical justifications for suffering and cruelty. In the end, Beauvoir accuses Sade of being the serious man described in her Ethics of Ambiguity.