If it's tl;dr for you, it's making the point most of us know and understand. Gender-affirming care for cis kids is and always has been fine. We can shave a cis boy's head, we can put artificial eye and lip color on cis girls (even very little girls) while giving them perms and teaching them how to walk and sit and dance in dresses.
We can alter cis child's breasts to make them more like their gender: removing breast tissue from cis boys, adding it to cis girls. Or just put cis girls in padded bras, or push-up bras.
We call children by gender-affirming names as a matter of course. (See "A Boy Named Sue" by Johnny Cash.) No one thinks twice about this.
It's only trans kids we deny this basic care and basic civility too. I'd ask why, but we know why. Transphobes are bigots, and the GOP is getting elected by pandering to them -- as they did in the 1960s and 1970s by playing to bigotry against black people, and in the 1980s and 1990s by playing to bigotry against immigrants and gay men.
Why can't MAGA voters and Evangelicals see what dupes they are? Well, they can. They know perfectly well that they're bigots. They like having someone to hate. And, of course, they still hate brown people and immigrants and gay men: they just know it's not okay to say so anymore.
Hate is their religion, and spite their motivation. I'd feel sorry for them if they weren't doing so much damage to the rest of us.