It might have been a little bit of wishful thinking for Tony to think Bucky’s past would never come up, but Natasha has a very good point. Everyone needs a second chance. You can’t help what you’ve done or been made to do, but you can do what you can to do good in the future.
And so, Clint stands with the Avengers behind Bucky as he goes to trial.
Captain America #611, pages 12-13. December 2010. #612, page 1. January 2011. Collected in: Captain America: The Trial of Captain America by Ed Brubaker http://www.amazon.com/dp/0785151206