My grandfather was similar. There is a bit more of sifting at the root cause, since his father died when he was 14, making him the man of the house.
However, he was drafted a few months after Pearl Harbor, was offered a chance to finish his education, but turned it down because he wanted to serve his country.
He became a staple in the community, helping people of all sort in all relations. Including his mother-in-law (my Great Grandmother), who was none to fond of him.
Even fixed TVs for them, and his neighbors (along with other broken appliances).
Stayed active in helping raise money for veteran groups, through the American Legion. Sold poppies by the post office here in the lovely Detroit area, the spring/summer before he died... which was in 2017 just shy of 95.
The point is, WII was very unique among wars. In part because of the type of enemy, the sheer numbers needed, and the psychology caused by it and the Depression in the minds of its veterans (remember, many soldiers went from the breadline to the front line).
It is important to remember, that generation is the one who helped the Civil Rights movement occur. The bare bones facts are, if a whole lot of people from the GI generation hadn't backed it, things could have been even less smooth.
Now it is important to remember,, especially following my last point, your grandfather and I are just two of over 16 million people who served in the war. There were bound to be some crappy people.
But, I do think, by in large, if you look around WWII and the Depression created more of a sense of civic responsibility in that generation.
Voting numbers rose sharply for them, and remained high.
Cap... he can do what others can't. How do you walk away, when you are the best?
Just because Evans might be done doesnt mean Cap is.
There's a lot more great stories to tell, and I'm sure there's an actor good enough to play the role of Cap in them.
As for Cap the character, I recall in House of M when the heroes who regained their memory were putting together a resistance and they left Rogers where he was because he finally found the peace he deserved.
I think the ideal solution is a world where Steve no longer feels he is needed as Cap. Where he can be Steve Rogers the astronaut, or Steve rogers the President, or just Steve rogers the nice guy who lives next door to you.