"I don't know." "I don't remember." "I'm not familiar with that detail." "It's not my precise area." "I'm not familiar with that letter."

These are quotes from the Internal Revenue Service officials who testified this week before the House and Senate. That is the authentic sound of stonewalling, and from the kind of people who run Washington in the modern age—smooth, highly credentialed and unaccountable. They're surrounded by legal and employment protections, they know how...