And Bucky killed the fukking KING himself! Brainwashed or not, that is an automatic death sentence in any other country.
You're telling me they're all redeemable, but killmonger isn't???
That wasn't Bucky in Captain America Civil War that killed King T'Chaka. It looked that way, but Zemo planned and set up everything to frame Bucky, so that would cause friction between Captain America & Iron Man to break up the Avengers.