You're reasoning from the standpoint that Russia was behind it while I'm reasoning from the standpoint that this is not a given and as such does not need to be front and center. Once the culprit has been caught there is enough time to finagle out where he got his motive, mode and means. If this turns out to be something related to some foreign state it can and should become the issue, now with actual proof of their involvement. Starting out with 'Russia was behind it, we just need to find proof' is counterproductive because it ends up like the boy who cried 'Wolf!' or its modern urban equivalent: howling car alarms. Nobody blinks an eye because they've heard it so often it blends into the background and is most likely false alarm anyway.