Conspiracy theories that I believe...

... any why

Bilderberg, etc.

Those secret organizations where a bunch of rich people meet? They really do have rich people meeting. And they definitely talk about the "work" of being and staying super rich...

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... like how hard it is to get a good pilot for their private planes. It's just rich people hanging out and bullshitting with each other about how cool it is to be rich.

"Disappearing" flights

Some of those small planes that disappear in the middle of nowhere probably are taken down by this government or that government...

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... the reasons for this are probably way more mundane than we'd think. Something like "the dude on this flight is involved in a trade deal that this other country depends on in order to make cheap oil for this other country which might later become an enemy of this future ally of our country".

Bermuda triangle

There are a lot of flights disappearing in the Bermuda triangle...

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... it's really hard to navigate there. They crash.

Surveillance

They (the NSA, or whatever your country's equivalent organization is) really are monitoring everything you say online.

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... they just are unlikely to actually care. Too much data, too little time. And even if they could review everything, you're probably not that important on a national scale.

MLK assassination

MLK was killed right after he spoke out about Vietnam...

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... because his assassin was a racist murderer who hated strong black leaders, not because he cared about Vietnam.

(Sorry, Zack de la Rocha. Wake Up is still a good song though.)

Cancer-causing ingredients

There are a ton of ingredients in various products and foods that will give you cancer...

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... but you'll die of innumerable other things first.

Anthrax

Bruce Ivins was blamed for the 2001 Anthrax attacks despite the evidence being inconsistent...

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... because the FBI was under substantial political pressure, and he was an obvious suspect. Plus he was a rather weird dude, which made it an easier "sell". Especially once he killed himself -- after that, he couldn't defend himself.

9/11

9/11 was a conspiracy ...

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... A bunch of terrorists conspired to undertake a coordinated attack against the US. Most coordinated criminal actions are conspiracies, sorta by definition.

FEMA camps

FEMA has plans for camps that could be filled with thousands of Americans...

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... because after a historic natural disaster, there's gonna be a lot of people without homes.