Because Republicans campaign on the principal of “government is inept” and do everything they can to make it so. They’re literally trying to destroy it from within to make their claim true.
Their motivation for destroying the government is their corporate funders. A weak government means corporations have more freedom to truly fuck over their customers and workers.
Money is their God and country.
Edit - I forgot to include their extremist faction’s motivation since Trump took the wheel. Foreign funders. Russia and China have Trump, and therefore the MAGA faction, in their pocket.