And that's at best! For many, the cruelty of making their perceived opponent less happy (without any benefit to oneself) is sufficient motivation for them to support policy. Policy as a tool to "hurt people"[1].
1: https://www.vox.com/policy-and-politics/2019/1/8/18173678/tr...
Possibly part of the envy is the disparity in wage visibility. Nobody knows how much people make in the private sector, whereas government salaries are a matter of public record, and can seem high relative to a sub-living-wage job, while also having "cadillac" benefits, reasonable job security, and comfortable working conditions.
I've read (and probably seen) that there are large regions of the Midwest where the only towns with any appreciable prosperity either have a college or a hospital, or both.
My experience in flyover republican country is that anything that makes a government agency worse, or makes a government worker less happy is good, because it can help bolster the private industry alternative (but complaining about the private alternatives, or wait times at government buildings is perfectly okay).