Try not to distort what I have written, no matter your own misinformation.  Parents are not prepared for every single occurrence in raising a child.  A lot of parenting has to do with doing the best they can in dealing with unanticipated situations, and having a trans child is certainly one of them.  Those parents facing the task of helping their trans child need - and welcome - the help and support of a professional who can help them understand the complex psychosocial and medical issues, and how to find ways to effectively parent and advocate for their children.  It is a partnership that is essential for the child.  What you suggest is leaving parents struggling by themselves with issues they can't even grasp initially.  The role of a properly trained professional is to help parents love and understand and support their children who present with this issue.  It is not to replace them, but conversely parents can't simply do everything needed all by themselves.  Why not have both?