Like thousands and thousands of Americans, I've filled out an SF-86, the Questionnaire for National Security Positions. In order to let the government determine if it can trust me, I trusted them with vast quantities of private personal information. This included not only responses to 127 pages of questions, but personal interviews with security officers, not only for me and my wife but for many people I've known everywhere I'd lived to the date of the adjudication of the clearance. The file, in other words, is as complete a set of information about me as you could hope to procure, given that it was created with my complete cooperation and with a very thorough background investigation.
How nice to know that the government took such good care with my trust.