[racional]

[Troll farms, recent German scandals etc]

I'd continue further with you here, but you seem to be very, very confused about some very basic things. We were talking about (empty) claims of KGB influence back in the 1980s. Not modern troll farms or German scandals in the past decade. The latter have absolutely no bearing of any kind on the former.

But various journalist do make educated guesses on this without the "we did it" explicit proof.

At least in principle (when they are not being grossly irresponsible) they attempt to draw inferences from boring things like, you know, actual substantiated facts (from multiple sources), or at least interviews with people claiming direct knowledge of such. Not -- as we have with the assertions you are strenuously defending -- wild-hair speculation about "could have" happened, in the complete absence of any hard facts or direct evidence of any kind.