[bsder]

> Why the hell is there a postal service in every country

Because delivery of packages to rural areas is terribly unprofitable.

Certain things need to be socialized in order to keep a country connected and enable development.

Without things like the post office, rural electrification, and the Eisenhower Interstate system, vast swatches of the US would have zero economic output.

[greggyb]

Please read the parent to my comment, and particularly the last sentence of that.

Context is important.