No. I did not claim my opinion is more valuable than yours, though that is what I think, because I think it is more informed. And I say that hesitantly, because there is a lot about Gender Dysphoria I don't understand and won't pretend to understand. I know the psychologists aren't on your side, and that's enough for me. In any case, you have not shown, nor provided any argument, to suggest that DNA and chromosomes have no influence in one being a transsexual. Your position suggests that these are binary influences, they either make one completely a male or completely a female, as evidenced by the appearance of the relevant genitalia. I suggested you might want to re-think that, because that position is woefully inadequate. Most obviously, some people are born with no clear or discernible genitalia at all. How was their sex determined by their DNA and chromosomes? I provide some evidence for you to consider, both of which argue that biology plays a significant role in Gender Dysphoria.
1)
http://www.religioustolerance.org/transsexu3.htm
2)
http://en.wikipedia.org/wiki/Gender_identity_disorder
*Edited* My first paragraph was unclear the first time around. Sorry about that.