In Soviet Russia you do not critique the government, the government critiques you. If necessary, jails you. If absolutely necessary, poisons you with Polonium-210.
The first person of interest would most likely be the user of the IP address at that time.
It's unfortunate that operators of Tor exit nodes have a large amount of risk placed on them, but I don't think it's a situation borne of Soviet-era backwardness or unique to modern Russia.