I had a realization that the very existence of private domestic shippers in countries indicates a failure of their government to provide universal infrastructure needed by all citizens.
There may be specialized needs like same-day couriers, special handling requirements and other edge cases, but those should be small specialty houses, not international mega-corps.
I agree with you, But I suggest that you look at your own position through the same slippery slope argument. If medicine has to be socialised, why stop there? If you think medicine should be socialized, but not package delivery, why is your opinion more valid than someone who thinks that package delivery should also be socialized? Or than someone who thinks that neither should be socialized?