For example: NSA wiretapping was a truth that happened to align with pre-existing conspiracy theory narratives. It was easy to dismiss it as a crackpot theory, but that didn’t make the truth any less (or more) true.
If someone says “if you believe this might be true, you’re [a bad person]”, I would consider this person fundamentally against truth, and someone more interested in shaping narratives than upholding accuracy and integrity.
I think that is the goal. Destroy trust in formerly trustworthy sources so that the reality you see every day more closely aligns with one of the many conspiracy options.