They regard this as a crime not much different from a bank...

They regard this as a crime not much different from a bank robbery. Their philosophy's very simple: If you interview enough people, eventually you'll find somebody who knows something. They do not think this is a perfect crime. At some point, they believe, the people who perpetrated this will be bragging either to people they know or in postings on the Web. If you start leaving your handle around, you're leaving a trail the FBI can follow.