That's part of it. The other part is that fewer and fewer high-quality, first or even second-rate, competent people are willing to work with Trump. So, he's stuck hiring whomever will actually agree to take the job. In an increasing number of cases that's the ultrapartisan, extreme right loonies like Gorka, DeVos, Carson, and now Ratliffe. If it wasn't for protests and even a few Republicans privately complaining about some candidates, who then withdrew their names, the total of such people in Trump's Administration would be even higher.