Here:

a culturally diverse society can be dominated (ruled) by one social class, whose dominance is achieved by manipulating the societal culture (beliefs, explanations, perceptions, values, mores) so that its ruling-class worldview (Weltanschauung) is imposed as the societal norm, which every social class then perceives as a universally valid ideology that justifies the social, political, and economic status quo — as natural, inevitable, and beneficial for everyone, rather than as artificial social constructs that benefit only the ruling class

So when you're off-handedly saying that something is "good sense", the long Western educational and cultural tradition of left-liberalism, which is undoubtedly the most influential one around, might have something to do with your implicit thought process. It's not an agency fiction because I'm not suggesting that there's a cackling university professor somewhere who plotted molding your idea of "good sense" to include a degree of PC-ness, but merely that it's mostly the memes that don't go against the intellectual classes' convictions and preferences which tend to survive, so ideas kind of flow towards an intellectual-dominated consensus.

Again, I'm not even sure that this is a bad thing.