The thing is they know it is true.
More important to these people is psychology, and this is how it all started. Advertisers, politicians, media and propagandists possess a scientific understanding of human psychology and various impulses like the need for social acceptancen and how to manipulate that.
This is how most make their money Success in advertising seems like a lottery, while you can't predict whether a funny advert or an iconic logo and brand will catch on, you can improve your chances, you have to make an effort to tap into this or that element in the lives of your consoomers. They use fear of humiliation and women's display behavior, for example, to convince them to buy new dresses for every season and keep up with the fashions, their popularity hinges on it. They famously used the same strategy to convince women to smoke in the 1920s and it has expanded to everything else including social causes. Feminists talk about "masculinity" all the time, because it is drawn from advertisers appealing to "masculinity" and typically male behavior like competitiveness.
However like the double slit experiment it stops working the moment your audience can observe your methods and what you are doing. If people knew they were being manipulated and how they would instantly reject it all. Thus we start to see a return to the obscurantism practiced by the medieval Catholic church. Commoners are not to view their sacred tomes, if they attempt to discuss these topics, they are viewed with suspicion as heretics. Try discussing evolutionary psychology with a feminist.
Now in comes genetics. If white people knew the truth, that black people will never be high IQ and low crime without massive CRISPR gene editing or something, it would affect how they vote. They would aim to live in white neighborhoods and avoid paying taxes to the black community, basically bring back segregation. So we see the same. To be a "racist" is to be an outsider, or "the other" as they say.
