Quite true, but that doesn't make them thugs or change the fact that a lot of them work hard and do their best on the job and that many have very conservative instincts. When I worked at the US Postal Service in the 1980s, I'd say that most of my union coworkers I knew well were strong Reagan supporters.
Politics of it is irrelevant....it’s a practical, financial reality. They cannot exist without a financially healthy private sector. Overpaying and over benefitting is a prescription for bankruptcy in any industry, anywhere, anytime.
The Laws of Economics...in the end are Laws of Mathematics and .....reality.
I dare say that most of today's USPS workers couldn't even spell 'Reagan.'