As a transman I get where you're coming from, but as a parent.. if my daughter came to me and said she was transsexual and wanted to have chest surgery.. I'd be understanding and supportive, but I'd be feeling the same thing that every other parent feels.. this is my little girl, and the little girl I helped create is not only unhappy with her body, but is planning to alter it.. and every future plan (no matter how slightly) that I had for her.... No the surgery isn't mutilation, yes for most it is necessary, and yes we aren't our parents daughters anymore.. but for a parent you're always going to be in some way, even just in memory their little girl.. and as a parent I still have to think that this is something that you never get over, you just learn to accept each new thing as part of the process of the child you love being able to finally love themselves. I'm not saying you shouldn't be upset that she doesn't understand... just that maybe we need to try and understand them too.