No. You cannot blackmail people of this stature and power and influence and live very long.
IMHO it was a Bohemian club of sorts or a subset of.
Why not? It is done all the time. Epstein need not have been a single individual who was doing it. He could easily have been an agent of a government or governments.
Killing him would not solve a target's problem.
Using blackmail to extract information is one of the most common tools for an intelligence agency.