That was my thought too. It's typical liberal thinking...that British citizens aren't smart enough to vote to break with the EU, so the Russians had to be behind it. Same crap here with the Democrats. And so they come up with a phony dossier to prevent Trump from getting elected, and save us all from ourselves. They make me sick.
The modern U.S. intelligence agencies were created and chartered with one purpose at the time and that was to match the efforts of the Soviet KGB. The conditioning was to see a Russian behind every problem. Once the Soviet Union fell apart, the American spy agencies had the same one answer to every problem.