Earlier quoted context omitted.
> CNN et al also claimed knowing it was Russia. They did? Source?
They did not. There was all sorts of speculation and enough circumstantial evidence to implicate either Russia or Ukraine or the US depending on what your threshold is.
Usually it goes like this: axis of evil horrible rouge state X has done bad things in the past and we all know how they are bad. There is some evidence to suggest they are at it again. Totally compromised person you shouldn't trust (and did we mention their horrible fashion sense?) suggested it may not have been rouge country X. There is no consensus.