what’s the logic behind the reasoning of Jenner about the trans cause?
She cares about herself and only herself...
You also need to understand people have all types of motivation for transitioning.
Some people just feel more comfortable and want to live life that way, some are like Noem's husband and it's just a sex thing where they feel humiliation but want that.
But like everything else, it's not a binary thing. She might want to transition full time and live life that way, but still (at least subconsciously) wants to be humialted and that's why she's republican.
It's always super weird when any community wants to act like a monolith or that the solution is 3-4 categories instead of 2. The real answer is human variation is never binary, and everyone has their own motivations for everything they do.
Thinking of her as being transgender and trying to view everything thru that lens is just as dumb as any other gender discrimination, or really any other.
She's a piece of shit who supports other pieces of shit, her being transgender doesn't automatically mean she does (or needs to) support everyone else who transitioned. Like, I know people that transitioned, I don't expect them to defend Jenner just because of that one shared experience. Because that's still just one aspect of them as a person.
But people still expect Jenner to support everyone who transitioned for some reason. Even when they disagree on literally everything else. It's distilling everything down to "us or them" and the reason this line of thinking is showing up on the left, is the American education system was gutted generations ago.