It is called conquest. They don't need to be nice as they come in and conquer. The myths and beliefs of the last century or two have to die, as it turns out the old ways never died. A people move in jn large numbers they will conquer the people who let them in, simple as that.
I do wonder what this has done to women psychologically. One of the principles of early game was that women were reverting to a feral nature, but I am not convinced that is true. Cavewoman who behaved like this would have died out, there were consequences throughout most of history for women's behavior. I am wondering if all of these protections and rights have turned a good chunk of women into demonic beings, into creatures who would have rightly been called witches in saner times.
The entire feminist system is designed to only produce only two types of men: illiterate thugs and effeminate bookworms.