All this complaining about Trump's trumpery of Russia does is make the US, and particularly this Administration, look very weak: "Oh, my gracious!, a country with 1/3rd our population and 1/5th our wealth is stealing our election! Mother, make them stop." It's pathetic and distracting. Just chalk this up as another one of Trump's inanities and move on.
Uh, the hack on the DNC is not outside the capabilities of many criminal organizations, let alone a country like Russia, who is known for its expertise is technology. Russian hackers (state sponsored or not) contribute massively to the number of hacks around the world.
Point is, even Ukraine could orchestrate such a hack (Ukraine is also a major source of cybercrime, in addition to Russia). It really doesn't take a whole lot of resources or manpower for something like this.
What you are speaking of is a matter of law enforcement and intelligence gathering. Let the investigation proceed: when the FBI can make a fact-based report about the breach, then, and only then, should it become a campaign issue. Until then it's only impotent rage.