I am not that poster. However, it seems that many are arguing if the source is legitimate, but tacitly accept it is StateSponsered. Yes, we are actively in a coldwar, however, that does not mean it is Russia.
I am extremely suspect of the sources agenda. I agree with you this has the markings of a manufactured agenda on it. It could certainly be Russian operatives; or some subset of information was handed off from a highlevel RU source, but that is not proveable nor are there a reasonable amount of credible evidence.
The media has spent time discussing "Russian" involvement in near synchronicity-- moreso than the content of the emails.
There has only been limited time to remarks questioning a second Snowden like insider, which on the program I heard (NPR) there was casual speculation they were a Russian plant.
There are many outfits capable of this one might imagine. The "this was so easy"-esqu bit strikes me as utter bullshit. This whole leak seems extremely awkward, and its motivation is unclear.
The lack of real evidence & the unlnowns about the underlying agenda are scary. Clearly, someone who is powerful is behind this, if they are able to evade detenction by the NSA as well as gain entry to one of Americas most powerful correspondence.