It's interesting that you present Butina's case as having been a fair trial. Her "crime" was basically naive, opportunistic networking with influential people (all of which was done publicly and even documented publicly on social media, so hardly consistent with a conspiracy). Hordes of people do that on a daily basis without registering as a foreign agent. But she's Russian, and in the age of Trump/Russia hysteria, that means you get selective enforcement of vague laws. Add a few months of solitary confinement and you arrive at a guilty plea.