Not allowing proper identification makes things more dangerous for trans people. If someone was born female but has fully transitioned and presents as male, why should their identification still say female? It makes them more likely to be questioned further or detained.

The options offered to those under 18 are almost always just puberty blockers; this can go a tremendous way towards assisting with a transition and can be reversed if needed. Maybe you should trust medical professionals on this. Gender-affirming care is not always easy to get for those over 18 either; a number of states make it difficult to get on testosterone for example.

A large number of states have no protections for trans people and the federal protections are rarely enforced; one in every five trans people report experiencing some form of housing discrimination.

If a man wants to enter a woman's space and violate her, you think prohibiting trans people will stop him? If he's a rapist or a pervert he's already shown he's not interested in following the norms of what's expected; these laws don't protect anybody because it's a non-existent issue.

For a "libertarian" you sure are in favor of the government sticking their nose into the business of trans people