So what, exactly, is the benefit to Russians to "fuel divisions" in US politics? And isn't the US two party political charade inclined to fuel divisions perfectly well on its own? They used to call it "muckraking", it's an old tradition in US politics.
The question must be asked, "hacked the DNC and DCCC *to what end*?" If the answer is simply, "To air their dirty laundry to the public," all I can say is, bravo.