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These falsehoods are never retracted because they are a critical part of the role they play.
This is of course one of the most frustrating aspects of political debate. Once you abandoned the idea that there is such a thing as reality, that can be examined independently of any personal opinions or emotional constructs, then there is no longer any reason for conversation.
There is a reason that our criminal justice system is so elaborate, with the right to the twelve different viewpoints a jury represents granted to defendants, and elaborate rules for what is and is not admissible as evidence. It's all based on the assumption that truth exists but is often difficult to ascertain.
Once truth has been abandoned, all thats left is noise. That the noise still has a sizable audience, is distressing but it's something we still have to deal with forcfully and continuously.