alt Hacker NewsComputers are generally useful because we have come to trust the output. How many people would use a spreadsheet that posted a disclaimer that stated (some of the calculations might be wrong, don't use the output without first checking each total manually!)?
That's an interesting example because spreadsheets are commonly and famously riddled with data errors and mistakes in their calculations. Despite this, many businesses are run successfully on the backs of them. Maybe a spreadsheet which acknowledges openly that it could contain errors would disincline a business user from trusting it; ignorance is bliss.