For centuries "developed" countries have depended on having reliable delivery of the mail. Fully privatizing it could result in it going away if there is no profit in in--more to the point, removing the services that are not profitable. We need to have mail delivery, even if it is not profitable. That is not to say that USPS should handle all or even the bulk of delivery, but it is to say that whether the current USPS is in the right form, we do need a public agency that guarantees the delivery of mail, even when there is no profit in it.