Me, I think Dean was all about Cap, but Sam, Sam was super into the various Bucky conspiracies - like, I firmly believe there were Buckynuts that had all these conspiracy theories about how he really died, you know? That train story is clearly a lie, just propaganda! He actually died assassinating Hitler/never got rescued/was on the plane and this was kept secret to preserve the Captain America myth… Tiny baby Sam, sneaking off to libraries to go to the Barnestormer Forums, where people look at all this evidence -the sketchiest of evidence, all “the shadow is in the wrong place! and “but the records show a B B James listed, which was clearly a psuedonum, as having died in the attack on…” and “by why are there no photos of him before enlisting?”- and argue over it. Sam got a temporary banning twice for ad hominim attacks (which he felt were perfectly justified), and once for gross abuse of explanation marks.
The meltdown on those forums post-Winter Soldier is astounding. Sam has to crack out his old login, just so he can in and yell “I told you so” at all of the “Bucky Barnes never existed and was just created for propaganda” forums, while also apologising for his, perhaps unnecessarily vehement defence of the “Bucky Barnes died assassinating Hitler and the train was just to provide” theory.