Sure, there was the attempted assassination of Reagan and the fears for Obama as the first black President, but in those cases it was a lone nutter rather than a conspiracy.
How long can Trump crash the market before an angry billionaire decides to take him out? The remaining Koch brother is already pouring money into legal challenges against Trump…
Ok this might be my new favourite conspiracy
Our universe is a simulation created by a group of facists that are using us to research how they can gain and maintain power. If a successful fascist regime takes hold then the experiment will be over and the simulation will be shut off, the only way to survive is to continue to fend off fascisum.