You know you are right so there is no harm in letting them do the audit.
Unfortunately, that is 100% wrong in a society infected with the disease of post-truth Trumpism. There is plenty of harm to be done with this dog and pony show.
The only harm will be proving fraud happened. That will not harm me.
The harm is in the implication that the results aren't fair, and that the election can be rigged. Why bother to vote if the outcome is predetermined.
When nations lose faith that their elections are fair, they are ripe for take-over by anti-democratic forces, and right now, the Republican Party is utterly and completely opposed to the concept of free and fair elections.
Depending on what poll you look at half the population or more already believe that there was election fraud. The audit could dispel that belief. A falsified audit would be easy to demonstrate.
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No, it wouldn't. People who believe in voter fraud at this point believe it despite 2 previous audits in this particular county. They believe it despite countless people on both sides that are actually involved in administering the election saying it was fair. They believe it despite no credible challenges being filed asserting actual fraud last election cycle. They believe it long after any reasonable person would have long since given up believing.
These people aren't interested in facts, they aren't interested in what's being demonstrated. They will and have rejected any demonstration that doesn't fit the narrative.