Is there a study that proves this? I did a brief literature scan and it seems to me that researchers are unclear about the causation direction of things like trauma, psychological disorders, and GID/gender dissatisfaction. I think this is a pretty important part of the ongoing debate.
I don't want to be the "citations needed" guy, but I do have a tremendous respect for science and I don't want to just have to go with my gut on something like this.