If the Dutch witnessed the DNC intrusion in 2015 and reported it to U.S. colleagues, it‘s difficult to understand why the Russian hackers were left to forage in the DNC network for months without being ejected. After all, Cozy Bear‘s attacks on the State Department and the White House were actively fought as soon as they became apparent. Allowed to root around the DNC unopposed, Cozy Bear could have harvested much of the material released during the 2016 campaign to embarrass Hillary Clinton and her key supporters within the party. One would expect U.S. intelligence to try to prevent that kind of thing.