[There might be some altruism mixed in there, but it's not something he feels necessary to tell Barnes right now. Not when he's already admitting to more than enough vulnerability as it is, with the way his throat tightens and tears threaten to prick at his eyes.]

That's another reason. Because you feel remorse, and that means you deserve another chance. I didn't personally pull the trigger on anyone, but I'm responsible for a hell of a lot of deaths. A lot of innocent lives. And if I got the chance to try and make up for a fraction of what I did, then I can't do less for someone else. Because I'd want someone to do the same if I was the one responsible for their parents' deaths. I don't want to end up like Zemo.