In an epic-sized 567-page report, the 9/11 Commission glossed over one of the most important aspects of the attack: all 19 of the hijackers entered the United States on legal visas, even though at least 15 of them didn’t qualify to do so under the law. And the panel mostly shrugged off the U.S. policy that Saudis were granted easier access to visas than any other Arab country. The commission’s latest interim report emphasizes, perhaps unintentionally, the importance of easy visas to the 9/11 plot. The panel revealed that one of the biggest difficulties faced by al-Qaeda was getting...