I’ve gone over this extensively in my thread:
It’s essentially a pearl clutching strategy under the guise of a cultural context, a pessimistic and fallacious form of confirmation bias.
Once you’ve deluded yourself into believing that “X normalizes Y” you’ll begin to draw connections between events under that lens which otherwise wouldn’t be there.
It’s a lot like karma, or religious people who claim that their preferred deity did it. They’ve already planted the seed of hopeful expectation, so anything that fits that prefabricated observation will fulfill their arbitrary connection.
A commonplace fallacy I see people make with regard to “normalization” would be “the material normalizes rape” then having a sex crime occur, and blaming the existence of such materials on the crime occurring, typically insisting that such material exacerbated the risk of it occurring, thereby holding the material accountable in a way that nobody involved in the production could have controlled beforehand or even foresaw.