Why I dislike MCU movies

That was selfish. Rogers was getting his ass kicked and Bucky had to step in and save him. Rogers couldn't fight his own battles. On the battlefield, he's a liability since his fellow soldiers would have to not only fight their own battles but also fight Rogers' battles. That puts his fellow soldiers at risk.

It's no different than an athlete who is injured and can't play but insists on playing. He becomes a liability to the team. Likewise, Rogers' health problems make a liability on the battlefield so it was extremely selfish for Rogers to want to join the Army and put his fellow soldiers at risk.

Then he should've sold war bonds or become a recruiter or do something else that doesn't put his fellow soldiers at risk. But Rogers was a selfish asshole who as willing to put his fellow soldiers at risk.