Exactly why would a government not suppress a conspiracy theory? More importantly, why would you trust any government that didn’t at least attempt to suppress conspiracy theories?
Since when is the government supposed to suppress anything?
I don’t mind if the government tries to suppress the ideas that the Earth is flat, that birds aren’t real, that the moon landings were faked, that the four elements are air, water, earth, and fire, etc.
We sometimes call that education.
Since at least the moment the species developed the concept of law and a government to enforce it.