There are many Right Wing conspiracies. There was Pizza Gate that prompted hundreds of threatening calls and ended with a man taking his rifle to DC and firing shots into the restaurant. All because they thought Hillary Clinton was running a sex ring in the basement of the pizzeria (the building has no basement FYI).
There have been others that can be quite specific from Trump insisting Obama wasn't a US citizen - to the persistent belief that the UN is trying to overtake the US to create a "one world order" - to a secrete "deep state" that's secretly controlling our government. There are also yet others that are far more vague - Jews are trying to take over the world - blacks are the cause of crime - and most Mexican's coming to the US are rapist and drug smugglers.
I believe the vast majority of these people aren't evil or crazy. They're just ordinary people who are deeply misinformed by Right Wing propaganda and a political system that far too often uses fear to manipulate it's members.