Epstein was used by the CIA to get blackmail information on the famous and the powerful. The threat of blackmail could then be used to manipulate these individuals, as needed. If the blackmail info becomes public, then it's no longer useful for blackmail. Consequently, the deep state is going to make sure that the valuable and useful blackmail stuff does not become public as long as blackmailing the individual in question can serve the purposes of the intell powers.
As an aside, the intell services also do not want attention drawn to their methods. They prefer that people think they use positive not negative enticements for cooperation.