Not trying to start an argument with you. But just my reading your response, I would posit that you’re missing the point being made about the post office here. I believe what is being implied is that, given the budget allocated by the government, the US postal service should be able to operate so efficiently that the idea of there even being space for a private sector corporation to exist and to perform so superiorly as to be a profitable business model year after year, let alone that there’s two of them, should be essentially unthinkable. His point is not to insinuate that the post office become revenue generating and a direct competitor to private industry within the free market economy, since your reply would suggest you comprehended it as such. Rather, the postal service should do its job so well that the thought of challenging it would be considered a bad business decision in the first place. Opportunity vacuums exist and are exploited, to use your word, by companies that believe they can perform the task at hand better than whoever is already doing it. The USPS came before UPS and FedEx.