Those are good points. Tony didn't even seem to know that Spoiler his parents were HYDRA assassination targets, not an unfortunate car accident. Although, wouldn't that have shown up in the files Natasha leaked? At least that the directives of one the missions was extraction of super-soldier serum back in 1991, and he could have deduced it from there. I feel that if he'd known his parents had been victims of HYDRA, he would have more likely had the space to accept that it was HYDRA the organization that killed his parents, and probably (hopefully) not put 100% of the blame on the brainwashed guy who was a victim himself. For me, I was still TeamCap at that moment, because we've spent SO much time with them. We see how much pain Bucky is in, trying to figure out how to live with himself and continue to fight what's been put inside him. We see how much Steve still believes in him. In addition, the audience already has the knowledge that HYDRA had the Starks killed since TWS Spoiler (and it was strongly implied that Bucky was the only WS they could control, so he was likely the assassin who did it), so we've already had that sitting in our heads. It blindsides Tony, but it doesn't blindside the audience. The audience has already accepted that Bucky is a victim throughout CW, so it was only on the basis of Tony's reaction that might switch the audience at that moment. It seems like a lot of people have, so kudos to RDJ. I wonder if my reaction would been different if it blindsided the audience as well.