I feel like it might have to do with how the industry markets the idols and itself as more perfect and catering to the consumers so the consumers fall into a sense of feeling that they should have a large say into what their favourites are up to whilst in the Western market, it is more of a "I put out this product, take it or leave it" feel.
That's true, there's more investment bc you assume you can change things with enough noise. However, K-Pop consumers need to realize the burden to put out responsible content that reflects changing cultural norms is on the producers not them. If they don't like what is being put out, don't support the art.
I wonder what plays into that culture around K-pop. It might be a mix of the infantilization of K-artists, the marketed struggle of it all, the higher amount of parasocial relationships, the hyperfocus on company brands, etc.