We need the illusion of 'free will' and 'altruism'

Appeals to “good sense,” “right-mindedness,” are simply evasions of the basic principles of reductionist thought. According to E. O. Wilson, we need the “illusion of free will” as biologically adaptive; we need the “self-deception” of altruism.
 But what possible good—moral, intellectual, or evolutionary— can come from belief in free will and  if they are illusions and lies?