It is worth being more precise than "there is a lot of opposition". That opposition corresponds to a political ideology that public entities like mass transportation and USPS [1] should break even to begin with.

It's not a requirement that these public services break even. In fact, (controversially) it's the opposite. [2]

[1] https://about.usps.com/newsroom/national-releases/2019/1114-... [2] https://en.wikipedia.org/wiki/Deficit_spending