Disregard the names and just look at what happened here: For a period of time in 2016 we had a presidential campaign where one major party candidate had spent years collecting bribes from foreign interests and the campaign chairman for the other major party candidate had made a fortune lobbying in Washington for those same foreign interests.
If there's anything "lawful" and "ethical" about that, then I think we've identified the heart of the problem.
Bottom line, the world knows that the chances of Manafort being prosecuted, absent the Trump tie and the BAMN philosophy of those who want to take Trump down, were exactly zero and not a scintilla more.