The website Advocate.com reports a study from the October issue of Pediatrics which finds extremely high incidence of attempted suicide behavior among transgender teens. In some cases more than half have tried to kill themselves. Suicide behavior is normally associated with mental illness.
The PC view is that being transgender is merely one of a host of possible sexual orientations. All of these are seen as within the normal range of human behavior and essentially equally valid and healthy.
Perhaps the PC view is wrong. Suicide is not healthy. Perhaps feeling transgendered is a by-product of relatively serious mental ill health.