I’ve known some conspiracy theorists. There’s really no arguing with them. For one thing, to seriously contemplate being wrong on the matter during a conversation is to willingly name themselves fools in front of others. Not many people are willing to do so, regardless of the evidence.
Many CT’s really WANT there to be government conspiracies. I’ve noticed general trends among the few I’ve known. They are usually closet or hobby anarchists and like to dabble occasionally (or more) in less than legal activities like drugs, guns, explosives, boozing and driving, etc. It’s a lifestyle of sorts, and eventually the law catches up to them. They feel persecuted by law enforcement, so a totally corrupt and evil government is a very convenient fantasy for escaping reality.