What I hate the most about USPS is the whole insurance thing. They use it as a get out of jail free card if you don't buy it. Like whatever damage they do, no matter how severe or idiotic the reason, is not their fault because you didn't buy insurance. That really drives me nuts.
One time I got a game just crammed into my letter box, when there's a freaking package box literally a foot away! That's completely the stupid mailman's fault, and I literally got into an arguing match with the post office manager who didn't back down from the insurance thing.