Because the Republican/Libertarian dogma is that government does not work and is inherently wasteful, that only private corporations are efficient and good. Their goal is to destroy the entire government and replace it all with private contractors doing the same thing for more money and half as well. Ignoring the fact that they are themselves government workers, and that there are many necessary services that explicitly should not be run to maximize profits, they’re also fundamentally wrong that the government is somehow uniquely wasteful and inefficient. It’s just one of many false beliefs they have, the biggest and most damaging of which being the idea of trickle down economics.