Name a single culture that adopted the values and pracrices of a nation they defeated in warfare.
This is fairly common throughout history. The Mongols did it to such an extent that the Chinese considered them Chinese when they ruled China. It also happened a lot when various empires conquered Egypt or when Alexander conquered the Persians. It happens more often than not.
Fear mongering is an interesting thing. You have people who call articles about COVID or climate change fear mongering. Then you have other people who called the NO campaign fear mongering. And there seems to be zero overlap between those 2 groups.