As always: further research is needed.

You sound well meaning but uniformed. Sure more research is always good but this is already a very well understood field and I have ample sources to prove it.

I can understand that people are hesitant to allow gender affirming care, because they fear they might do more harm than good.

First off, there is absolutely zero surgeries being performed on minors. This is not happening. What is happening is puberty blockers and hormone replacement therapy, both of which are non-permanent. And once someone becomes an adult and begins more permanent affirming care, the rate of people experiencing regret is laughably low.

• A total of 27 studies, pooling 7928 transgender patients who underwent any type of GAS, were included. The pooled prevalence of regret after GAS was 1%.

all those trans issues must seem like a new trend, I certainly didn't hear much about them 10 years ago

I think you need to understand your personal limitations. Because it's really not new, I mean I can point to ancient history with people like Empress Elagabalus, but if we just want to talk about modern medical transition there is Dr. Alan Hart in 1917 or Christine Jorgensen in 1952 a WW2 vet that made national headlines. The diagonosis of gender dysphoria has existed in the DSM since 1980. Trans identity or medical transitions is very far from a new concept.

Unless there's something like a proper scientific guideline,

Every major field of related medicine abundantly agrees that this is safe and necessary treatment. Such as American Academy of Pediatrics, American Medical Association and American Psychiatric Association.

There are already numerous safeguards, such as to receive any gender affirming care (which is only ever provided to adults) requires multiple years on reversible Hormones and then letters of support form two separate psychiatrists.

Weather or not a doctor is allowed to prescribe proven treatments to a patient suffering from a preventable, manageable and curable condition is NOT something that a judge needs to determine. It exclusively is the purview of a patient and a doctor, not the law.

As a trans person myself, I need you to understand that reticence by the cis population is dangerous for the trans population. So while I can understand why it sounds extreme to you, that should only be a reason for you personally not to seek this sort of care. Not a reason for you to support roadblocks against the advice from medical professionals.