>>100876134Because Steve Rogers has never done anything but what he thought would make the world a better place, putting himself on the line whenever he had to to do it.
He doesn't fight out of hate or allow oppression. He doesn't toe the party line when its on the wrong side of his morals.
The super soldier serum is what made Cap powerful, but his strength has always been his unshakeable sense of right. Its hard not to be in awe of someone that is everything you know you should be, even want to be, but you let the world drag you down instead.