Well there were two lead suspects and Russia was one. Russia's general invading and slaughtering tends to bias people against it a bit.
I got the feeling that most people didn't just suspect Russia but wanted it to be guilty, with all the global consequences that would come with it. The reactions to this news around the web confirm it.
Pretty much, this news didn't make it to the front page of HN like the other one did, but the downvotes are real. Happy Brave New World.
I hope they are real people - this way we know where a crucially important bug deep in the system exists.