The only standard for care is to assist in transition. No other treatment is effective. It isn't cosmetic; hormones are not cosmetic it changes much more than just your body. Surgery doesn't just change how you look either. The former affects how one feels and thinks and the latter affects sex life.
There are these things called standards of care and nothing in it says to deny one the treatments they need.
https://www.susans.org/wiki/Standar..._Transgender,_and_Gender_Nonconforming_People
Historically there have been several people across several cultures and time periods who are what we would call transgender today. Some societies had accommodations of varying sorts and some even still do today. In various cultures there are and have been things like twin spirits or Hijras which were both third genders and in both of those instances they wre the cultural adaptation of the reality of people who are transgender. In some Indonesian cultures there are as many as 5 genders and likewise their genders reflect transgender MtF and FtM ect. Gender is not a hard and fast thing.
I would think that someone of your persuasion would support gender variance as it would help one be more in-tune with themselves as a distinct entity.
Also it's not and hasn't been considered a mental disorder for a very long time. And even when "Gender Identity Disorder" existed the only recommended treatment was transition. Unless someone is nonbinary enough to be content or happy with their bodies it's very rare that someone who's transgender will be happy without being seen as their identified gender. For many of us transition is the only way for that to happen. Trying to convince us that we are anything different doesn't work.
A lot of study has been done on this and basically the scientific view is that the brain is affected by hormones in the womb that affects it's development. So it's not wholly psychological.
I kind of think that pathologizing gender is like pathologizing sexual orientation.