China's post office works the way ours did in North America with low rates, I never buy American, online, though I would like to, shipping is way too expensive. China delivers for free and is eating our lunch by selling directly to Canadians and Americans with free delivery and low prices. It's not just Amazon killing retail, that's just where people who write the news shop online. The post office is a service like highways and should never be based on profit (sensible efficient management yes), but by service and price. America could sell a lot more retail to the world with sensible postal policy and create many small and medium businesses by leveraging technical innovation better and this is a way to do it.
Wealth redistribution is necessary and good in our current economic situation, infrastructure, healthcare and postal services are a way to do that. Cheap shipping lowers costs and makes folks money go further while allowing America to compete in the global retail market (applies to Canada too). Retail is going global and has already, China lead the way with Banggood, aliexepress and other largely international online retailers. Big shippers can offer free delivery in North America, but small businesses are fucked internationally in retail.