Here's an example from the Philippines of why, when transcribing official documents, a genealogist should leave even obvious errors uncorrected.
I had a friend whose birth was recorded in a faulty typewriter of a provincial municipality. The typewriter would produce three letters instead of one, such as in his case three Rs instead of one. He was called Rex but the typewriter showed RRRex. Since that was how his birth certificate showed it, he went through life with that spelling because that was what was demanded by every government office he passed. All mindlessly insisted that he spell his name with three Rs. So, he did to save himself grief. It was irrational and ridiculous and he went to his grave with the three Rs. [Link]