in star trek voyager janeway says that she understand how Einstein devolved the "A" bomb and how marcus developed the genesis device and that the watch helplessly when it turn to use for destruction, the genesis device was never use for destruction, khan use it to lure kirk to him but the genesis devise explode in a nebula creating the genesis device, spock sacrifice himself to safe the ship but its not genesis who was responsible for that, so genesis was never use for destruction.
did marcus or anyone else try to reproduce the genesis device?