Robert Mueller is supposed to be investigating Russian hackers who were spying on political emails during last year's election, but reporters with the Associated Press are doing a better job than he is. The AP reported last week that the Russian hacking group Fancy Bear was spying on more than just political emails and FBI .leaders knew it. The FBI failed to warn the vast majority of hackers' targets that the Russians were reading their emails. The FBI allowed the Russians to spy on the emails of "the former head of cybersecurity for the U.S. Air Force. An ex-director at...