"there is no hard science for TG"

I don't pretend to be a scientist, but I just posted three links above: two peer reviewed, the third with links to many more peer-reviewed sources. To counter that, you need more than a simple claim. Review the links and tell me where they are wrong. Here is the conclusion from the first one:

"Overall, the results support the hypothesis that there is a strong heritable component to GID. The findings may also imply that gender identity may be much less a matter of choice and much more a matter of biology." The source is credible, and peer reviewed. 

This appears like hard science to me. It isn't a credible rebuttal to reply with "no it isn't." You have to reply with scientific evidence, no? Show us where the authors are wrong. 

I don't disagree that there is much to be learned though.