You know people are born with genitalia that doesn't match their chromosomes? If you can be born with the wrong or both genitalia, isn't equally possible to be born with the "wrong" brain makeup? Additionally scientist believe the more social the animal species, the more queer their sexual habits become. As the most social animals ever, it's only common sense that our population has different mental and physical differences in order to better understand each other? Trans gender people offer such a boon to understanding humanity. They are a piece of the puzzle to getting past isms. (sexism, racism, etc.)