Gina McCarthy, President Obama’s choice to replace Lisa Jackson at the Environmental Protection Agency, has been chastised for having lied to Congress, in claiming that EPA did not use “dangerous manmade climate change” to justify new 54.5 mpg standards for cars and light trucks. She’s also been implicated in the agency’s practice of using fake emails to hide questionable dealings and activities. These issues highlight attitudes toward ethics, law and public policy that prevail at EPA and too many other government agencies. However, that attention should not distract from other important matters. Ms. McCarthy may be the worst of the...