I learned the other day about
John Money, David Reimer and his twin brother
TLDR: The "father of gender identity" (John Money) did an experiment with twin boys, when one's penis was damaged during a failed circumcision. Money convinced the parents to raise one as a girl, the other as a boy, and Money forced the twins to do "sex acts" with each other, and he would also take pictures. The boy twin overdosed on antidepressants, and David/Brenda (the "girl" boy twin) committed suicide after learning of what happened, reverting back to male and having a failed marriage, personal problems and the death of his brother. It is this bizarre experiment which forms the basis of "gender identity".
In summary, this gender identity theory is the work of what we would today call "a pedophile", or perhaps something a little more palatable like "minor attracted person". Of course, I could be wrong about his motives, and he was just taking photos of kids humping each other and examining each others genitals for science.
But I can see how Tucker Carlson is the bad guy in all of this.