This is the premise of the Predators franchise. The predators did not invent their technology. They were a slave race who slaughtered their masters and took their advanced tech. Now a bunch of savages have plasma casters, stealth tech and convenient interstellar travel.
Any time you see something dumb in a Predator movie: that's because they're dumb.
Indeed. Actual government conspiracies such as COINTELPRO, MKUltra, Operation Choke Point, etc were not leaked by conspirators. They were discovered by unrelated means despite perfect lack of leaking. You can indeed get a bunch of people in the FBI or CIA to coordinate and keep their mouths shut afterwards. Even (or especially?) when their actions are illegal and immoral.
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