Comics are always written to reflect current issues and themes, constantly changing and staying relevant. If they wrote them now like they did in the 40s/50s, people likely wouldn't read them as they can't identify or relate with them.
I wouldn't say that's entirely true, people will know the difference between eras/cultures, and make the decision themselves as to wether X era interests them and it's culture, and immerse themself into said era/culture, just like they do with music, movies, books, art...
Comics are also appealing to those loyal day one fans who have been with them from the start, and the late comers who have gone back and red the original comic, or had it passed down to them from siblings etc.
That's one thing that is gospel with comic book/sci-fi fans, they've red everything from the start, no matter their age/generation, and are quick to slate any change that ruins why they love the character/story - which is completely understandable, because no-one wants that story/character that they've invested literal years of their life in, becoming someone that they're not, otherwise they'd read a different comic with those Y views/story, if that's what they're after, but it isn't, and that's why they've chosen X...
Star Wars/Star Trek, is a perfect example of this, you're mocked and not taken serious if you haven't seen the original movies/series, as is the case with comics/manga/anime.
But yes within reason current affairs/views are allowed and do come into play, but not so much so that it destroys the story or the characters views. Fans are very loyal to the character and their beliefs/views/origins... And quick to moan when it's messed with!
The last thing we want, is people changing stuff to suit the modern 'I'm offended by everything change it' mentality, those Roald Dahl books spring to mind... If you're offended, don't read them!