The public has no capacity to vet the credibility of anonymously sourced claims.
Almost all of the current media narrative on the Russian story comes from stories with nothing more than "American officials say".
Remember that "American officials said" that Iraq definitely had WMD. Public support for the invasion was built solely on anonymously sourced news. American officials were actually politically motivated ideologues manufacturing consent, with journalists at the New York Times like Judith Wilson playing the part of the useful idiot.
The same thing is happening right now. This [1] New York Times story is a perfect example.
There is no place for anonymous sources on issues of war and peace in a republic. Allowing this low a bar for journalistic evidence leaves us completely vulnerable to manipulation.
[1] https://mobile.nytimes.com/2017/03/30/us/politics/devin-nune...