Power and control. (We'd reached the end of the thread, so I responded higher up in the thread).
Yes they want to control, not what just what people do, but what they think.
I honestly don't care what a person with a va**na does or says. As long as it doesn't affect me, I don't care. I will even use their chosen name and pronouns. But they seem to care rather deeply about whether people believe their claims.
Men cannot get pregnant. That is as true as 2+2=4.
But like in the book 1984, the party insists we believe that 2+2=5. It's not enough to allow others to say it. It won't even be enough to mouth the words ourselves. We must internalize the lie and say it wholeheartedly.
But even if we say and believe 2+2=5, it will not change the truth. 2+2=4, it always has and it always will, regardless of what absurdities we accept.