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Not sure what the relationship is between needing a USPS 200+ years ago and spending $Billions today to subsidize the USPS when private industry can do the job.
Women could not vote 200+ years ago, therefore they should not be able to vote today?
Your Sentimentality is very Selective.
Except the Private Sector won't do the job.
They'll do what they can make money doing. If there's no money to be made sending stuff to Aunt Gertie in the sticks, they won't do that.
They would do it: but not at a loss.
I see no reason to subsidize Aunt Gertie, or anyone else. If they want to raise goats 93 miles from the nearest UPS office, then they'd better sell more cabrito if they want to send christmas cards, but don't reach into my wallet to subsidize their lifestyle choice.