They are patriots. They regularly sacrifice for their country and its constitution. Their work is fundamental to democracy and the rule of law. They are nonpartisan. We depend on them for fair and free elections. Their hours are demanding and their pay is low.
These attributes make them perfect targets for presidential insults.
Why not? It is only by matters of degree the extent to which they share these attributes with Gold Star mothers, American POWs, our fallen warriors, frontline health care workers, teachers, the intelligence community, the FBI and virtually anyone, including those in his own cabinet who do not satisfy his demand for personal loyalty.