First off, I recognize that conspiracy theorists don’t ascribe to all CTs. Someone who believes 9/11 was an inside job may not think the Moon landing was faked, for instance.
That being said, it seems like no major world event has been conspiracy-free. JFK assassination? Wasn’t Oswald alone; a bigger plot. Pearl Harbor? Roosevelt let it happen. Moon landing? Faked. 9/11? Inside job. Sandy Hook? False flag. Covid-19? Plandemic, vaccine must be Mark of the Beast. Biden wins election? Stolen. Earth is round? Not! Flight MH370 disappears? Aliens took it. QAnon. Climate change? Hoax. Cancer? Big Pharma is sitting on a cure but won’t reveal it.
So the question is…what is the biggest thing or event that is accepted by all conspiracy theorists at face value, no questions asked?