The culture or alignment of any race (or other monsters) in the books are just the defaults. There have to be some base assumptions. I think the nature of the game requires easily identifiable bad guys for most people.I think this is where we have disagreed in the past, Oofta.
I totally agree that D&D simplifies many things. But I would argue that simplifying how armor works is vastly different than ascribing the values of a culture onto a single race.
I really do believe that scribing the values of a culture onto a single race, whether that's a made up race or not, is racist.
I don't think it's done in D&D in order to be purposefully racist.
But racism doesn't have to be purposeful!
I totally understand that you do not see the practice of ascribing the values of a culture onto a single race as racist. I'm not going to try to convince you otherwise.
I do see it as racist. So in my own D&D games, at my table, I make sure cultures are not defined by race. There might be a dominant race (this village of artisanal muffin bakers is mostly tortles), but I'm going to make sure that every Tortle is not an artisanal muffin baker.
I actually think WotC believes the same thing! But in the effort to keep D&D simple and fantasy oriented, they sometimes fall back on old, harmful practices.
Beyond that, we'll just have to agree to disagree.