I mean, all of this starts with their utter hatred of "the others" in all forms. But there seems to be special hatred for LGBTQ's, and even more for the trans community... Partially because Republicans can't get their minds out of the gutters, or quit thinking about what's going on in people's private lives.
I've said before there are reasons why I can't even talk to Republicans anymore. Part of it is I can't handle their Kool-Aid drinking. "The GOP stands for freedom and small government!" Sure they do - if you're not an LGBTQ. Suddenly, they stand for huge government and have plenty to say about what we do in our bedrooms, how we choose to present ourselves and live our lives, you name it.
You're right. How we live our lives do not affect others. But their bigotry and bullying and thirst for control harm us. They know it, too. The cruelty is the point. One day, what they'll realize is we're the strong ones, and it's been them that's been weak all along.
Bless you, though, for being a loving parent to mini-unblock and still loving and accepting her when she came out. I wish more trans kids had amazing parents like you.