I can relate to your frustration, I find errors in books all the time. For that matter, in every record source used for genealogy. But I wouldn't totally write it off. There are bound to be clues that can help you break through brick walls. Or find a better source with the information.
Consider the United States Census record. It is riddled with errors, but it is probably one of the most valuable records for genealogy. Birth year and birth state to some extent change from census record to record, but finding an entire family together in a household is one of the most important guarantees that you can prove relationships. The probability of two families having the same number of members, with the same name, same siblings or children is unlikely. So when looking for a person with a name, and there are several in the county with the same name and birth range, how do you sort it out? Having the family together in a single household allows us to find the truth.
So when you find these issues, that is a good opportunity to document in a researcher's notes heading. To let others know the errors you found for your particular profile, and why you believe it is error. So they don't spend countless hours going down the same rabbit hole.