if it's a conspiracy theory then why is it true?

The definition (or one of them) of a conspiracy theory is: "a belief that some secret but influential organization is responsible for an event or phenomenon".

Given that, it is not reliant on the truthfulness or veracity of the theory, so your question does not apply here in the way you think.
 
The difference between a conspiracy theory and an accepted fact is about six months. Therefore, you're just ahead of the curve! REJOICE!!!
 
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