How do USPS and Amazon work together to make disgruntled customers?

Legend has it that USPS could drop the package on the roof of your house. Many customers have complained that they never received the package that USPS said was "delivered." And Amazon always hates it when buyers and sellers communicate with each other. USPS and Amazon work together to annoy the customers. In the end, the poor seller loses the goods and money and gets a bad feedback.

Here is a communication log with a buyer whose package was "lost" by USPS. After several responses to almost the same question, I discovered that Amazon didn't even deliver my responses to the buyer at all. Fortunately, he eventually found the package in a secret location in his house.