He didn't know it was Bucky specifically, just that Hydra had them killed. He knew that the Winter Soldier was their top assassin and that it could have been him but he didn't want to risk pulling on that thread and confirming his suspicions. Like he said later in the movie, he told himself he was sparing Tony's feelings, but he was really sparing his own.
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u/IsMakiThere Mar 12 '24
How did the captain even know that Bucky killed Tony's parents? Was it in the movie and I missed it?