Falke / Steve
I'm sure you know most of the story back home. I think in part he offered to take on Bucky because he realized he had acted without complete information. But, because Bucky was someone caught up and hurt by all these machinations as much as anyone, if not more. and T'Challa's a compassionate guy.
You're not from the same world as him, but that's not so uncommon here. A lot of people are here with people similar to but not the ones we knew back home. And we make room for them. Like you are with me. He's trying to make room at the table for you, Falke.