There is only one libertarian position on gender-affirming health care, and that's to let it be a private decision of doctors, patients, and parents if a minor is involved. Worries that some people might regret it are no more a case for criminalization than the fact that lots of people regret taking drugs is a case against drug decriminalization. And if your worry is that we need to protect kids from bad choices, you need *much* weightier evidence of harm than anti-trans people can point to.