Arnold Kling says that it’s the nature of politicians.

We have to expect mediocrity from political leaders. They are selected by a very unreliable process. In general, I try to avoid contact with narcissists who spend their time pleading for money. Those are hardly the intellectual and emotional characteristics that make someone admirable, yet they are the traits of people who go into politics.

…The libertarian view is that private institutions, both for-profit and non-profit, are better at problem-solving than government institutions. Regardless of whether political leadership is wise or mediocre, our goal should be to limit the damage that public officials can do. Do not demand that they “solve” health care, “fix” education, or launch a “Manhattan project” for energy independence. Even for experts, those are impossible tasks. The harder we press our existing leaders to address these issues, the more trouble they are going to cause.