I take it you have never traveled to Washington D.C. and interacted with government workers.
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Incorrect assumption. I know DC quite well. A very large percentage of DC feds are Democrats. However, many of them also enjoy comfortable jobs and would like to maintain the viability of their careers.
There’s always a job for them in the swamp. When they get fired they always land on their feet. You don’t get a job in the DOJ without being well connected.