I suspect similar thought processes led to the 50s version of Captain America and the way that version was retconned in the 70s and 80s. Even the way Steve Rogers developed during that period is a response to those questions, though the answers weren't the same ones that you came up with.
In this case, he's from the future, so he'd have the advantage of historical perspective. He wouldn't look at civil rights protesters and think "they're trying to destroy America." He'd look at them and know history proved them right. (Of course, that's said from our historical perspective. At the time, it would depend on the personal beliefs of whoever was writing him.)
There aren't any women in the future, either. Very few in the present, too. Even in the crowd scenes, it's mostly men. Hmm, the future is comprised of buff men who don't wear pants and have no women around.
No, nothing odd about that. One other thing about future fashions, men don't wear hats any more. That prediction turned out to be true, but at the time? Even in the 20th century crowd scenes, all the men are wearing hats.