> You can hate the policies/movement and still have sympathy for the individuals.

I think people on the right (outright bigots excepted) would say they do have sympathy, and it's for kids who have been influenced by the media or whatever to think that they are the opposite gender.

> However, I'm not sure that encouraging young people to make one-way decisions (or decisions where we are not yet sure whether they are one way or not) is the correct approach.

And I think the response here is that not taking action is also one-way, causing irreversible changes, like to the bone structure.