The reason the Russians get blamed for a lot of hacking is, because they do a lot of hacking.
And trolling. At both hacking and trolling, they are far, far more active than the Chinese, Norks or any other bogey-group you care to name, except possibly "American nerds", and they don't count because they're doing it individually/independently, without co-ordination.
If you seriously, honestly doubt that, I've got an internet to sell you.