That last comment stung and Steve found himself rising to defend Bucky against what he said. He didn't feel like it was fair, even though none of this was really fair to begin with. The assassinations, Tony being attacked, just... all this.

"Bucky shouldn't have attacked you. That's his responsibility." He probably already said that, at least long time ago. But this mission with Howard and Maria... it was something completely different. Bucky had no will during that time. "HYDRA was still pulling his strings when your parents died."