My view is that transgenderism is consequential of the ideology of gender. Gender is a conservative ideology that says males are this way (dominant) and females are that way (subordinate). Thus, one who fails to conform to their prescribed social roles can become convinced that it's because they somehow metaphysically belong to the other sex. Gender ideology was re-popularized in its current form by $#@! movement theorists in the 1990s and has been streamlined onto the phones of the masses in the age of social media (i.e. today). It hinges on the Victorian era theory of the "male brain" and "female brain", which is probably nonsense you yourself passionately believe in.
Solving transgenderism means allowing for gender-nonconformity; it means not calling boys "$#@!" for playing with dolls and not referring to girls as "boys" for preferring toy trucks or video games, for example. Transgenderism is symptomatic of the fact that we need to broaden out and de-metaphysicalize our concepts of what it is to be male and female respectively. You see what I'm saying?
The only difference between you and a transgender movement activist in this area is that you subscribe to an older form of gender ideology that stresses the importance of gender-conforming behavior rather than gender-conforming identity. A difference of stress isn't a difference of principle.