There are good libertarian arguments for a government run post office -- particularly in how it support free speech, the right to petition, free and fair elections, how it uniquely protects 4th amendment rights, etc.
replyKey difference though is that the people/lobbies using libertarianism as a platform for support don’t actually care about free speech, etc etc. They care about money.
reply> 1. Some people (like libertarians) have an ideological opposition to government-provided services, and believe all or nearly all services provided by the government should be abolished and replaced with the "free market."
replyThis is achieveable with “If you want to be licensed to deliver postal services, you have to deliver everywhere without discrimnating on price”. And the free market will find ways to make that work.