We have good reasons to think the authorities aren’t great at catching errors. By contrast, we don’t have any good reasons for thinking these were actually errors. The fact that all stories about such errors each favoured Biden is reasonably improbable to happen by chance (12.5%). But it’s highly probable given mass election fraud, and so these stories should increase the probability we assign to such fraud having occurred. We also have multiple eye witness accounts, mostly from election or postal workers, who claim that fraud was being engaged in and ballots were being wrongly discarded.