Fair is subjective, but I personally wouldn't consider human error to be unfair, especially if it isn't significant enough to impact the result of an election.

Fair is subjective, but I personally wouldn't consider human error to be unfair, especially if it isn't significant enough to impact the result of an election. I think you'd be hard-pressed to call the landslide victories of Regan, Nixon Roosevelt, etc. unfair based on undocumented cases of human error. Elections have documented processes that are followed by poll workers in terms of counting (and in cases of suspected errors, re-counting). That's the basis for "free and fair", that the process is documented, certified, and public. It's fine to raise questions, but if all you have are questions, then not many people will believe you until evidence starts to emerge. But yes, any group has the right to ask whatever questions they want.