We don't exactly have a shortage of people who think trans people are just going through a phase and will grow out of it in the world today. Your view point is

We don't exactly have a shortage of people who think trans people are just going through a phase and will grow out of it in the world today. Your view point is hardly forbidden. Of course it would be bad if people cheered their kids into transitioning when they aren't actually trans - but I doubt this really happens, even in the most liberal and open minded San Francisco neighborhoods. Medical professionals constantly try and second guess trans people to make sure they are serious - and this is even more intense when the patient is underage. Secondly, taking cross-gender hormones is itself an excellent diagnostic test to see if someone is a transsexual. If the patient feels better, then it's a strong sign they will benefit from transition. If they feel worse then it's indicative that they are not trans. The effects of both estrogen and testosterone are fairly minor for the first few months and readily reversible. Doctors are starting to become more willing to give patients a "trial" on hormones without absurd levels of gatekeeping like in decades past. It's not like some poor, confused boy is going to put on his sister's panties one day and bam the parents call up their doctor and instantly transform the boy into a trans girl. Transition is a long series of many small decisions (medical, legal, social, sartorial and personal) combined with tons of introspection. It's not an overnight process that someone could realistically be pushed into by naive, overly tolerant parents, or anyone else for that matter.