It gets more fascinating when you check who was blamed:

"The Commission (the Roberts Commission) conducted two days of hearings in Washington and 19 in Hawaii. Its report declared that Washington officials had discharged their duties in an exemplary fashion. The fault for Pearl Harbor, it concluded, lay with our commanders in Hawaii: Admiral Husband Kimmel, commander of the Pacific Fleet, and General Walter C. Short, the Army commander in Hawaii. It alleged these men had failed to take adequate defensive measures and surveillance of the waters surrounding Pearl Harbor. Kimmel and Short were relieved of their duties. The words “dereliction of duty” were emblazoned on headlines across the country. The two were inundated with hate mail and received death threats. It was claimed their neglect had caused the deaths of thousands of Americans. Some members of Congress said the pair should be shot.
Kimmel and Short, however, protested the findings of the Roberts Commission, which they viewed as a kangaroo court. Roberts had run an unusual hearing – initially, evidence was heard without being recorded, and statements not made under oath. Kimmel and Short were denied the right to ask questions, cross-examine witnesses, or have fellow officers present to serve as legal counsel. They also found that the Commission’s report omitted significant testimony." ~Truth is a lonely warrior By James Perloff. CH 01