ShibaiDakine, 

And for all that, I, a single USPS, UPS, FedEx and DHL customer, have had more than a dozen packages and pieces of letter-class mail misrouted to incorrect addresses just this year alone.  Now that many items are barcoded and scanned enroute, and especially if you opted for the USPS "informed delivery" notices, such misadventures are easier to track and confirm.  But if you were to extrapolate my experience to the millions of households and addresses in just the USA alone, I think you'll agree that there is a problem, however insignificant it can seem if just talking about a single customer.

You cannot yet eliminate the involvement of human beings in the handling of sensitive or important documents and records, and therein lies the problem.