UPS and FedEx charge too much, and I do regular media shipping, so No, do not abolish them. If I could direct all of my tax money that goes to the US military into the USPS I would do that. Give them more money.
The fact that you personally use a heavily subsidized, underpriced service is not really an argument for keeping it on a national scale.
"I personally use and like a service" is a different statement than "it's in our national interest to continue gifting that service $10b per year in subsidies and benefits".
#1 assuming I am a he, you're already off to a terrible start. #2 seemingly believing that I am the only person who uses this service #3 the point is that it's not a useless service, and real people use and need it. turn on your brain.
"I personally use and like a service" is a different statement than "it's in our national interest to continue gifting that service $10b per year in subsidies and benefits".