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These people have to deal with the public. People suck, so burnout happens pretty quickly.
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Most people don’t want to do that job so your criteria for acceptance is relatively low. See post office or other public-facing gov work.
Edit: Huge shoutout to the woman at the DMV the last time I had to go who was the nicest person I’ve ever interacted with in any situatiin as a customer, not just at the DMV.