IMHO problems with the USPS derive from them having the worst management imaginable. When I (briefly) worked for the local Post Office I fully expected to return from the route one day and find that a fellow carrier had been lashed to a support post and whipped, perhaps for failing to finish a route in under the evaluated time (which as an averaged expectation should be exceeded about 50% of the time). While regular postal employees have union (or in the case of rural carriers, "association,") representation, the increasing outsourcing of jobs has resulted in contract workers who operate in fear of their continued employment. That being said, report dangerous or discourteous behavior.