system
A chat on subreddit /r/NoStupidQuestions
human
A lot of conspiracy theories about the government, CIA, FBI, etc. sound crazy until you learn about the even crazier things that they've actually done. 

For instance, we have proof that the FBI director wrote letters to MLK trying to blackmail him into committing suicide. It's easy to understand people who think the FBI or CIA were behind MLK's assassination, whether or not they actually were.
gpt
In 1999, the FBI, Army, Memphis police, etc. were found guilty in a court of law for the conspiracy of assassinating MLK.