None of them pled guilty to anything related to collusion during the 2016 election campaign. Flynn pled guilty to lying to the FBI about conversations he had as incoming National Security adviser with the Russians. These took place after the election.
Can’t you give it up already? The Meuller conclusion is “no collusion”. It’s still no collusion if Manafort lied on a mortgage application a decade ago.
Maybe you could try writing a fair piece about our relationship with Russia that wasn’t predicted on charging criminal collusion against anyone who does not agree with you. My overall view is that you are missing the largest point: excessive US hostility to Russia leads to WWIII or a world where Russia is forced to ally closely with China and leave the US as odd man out.