gay couples can have biological kids, using surrogacy or sperm donor. and even beyond that, if a trans woman's 
sperm was frozen before she transitioned then that can be used to impregnate her cis partner. the trans woman could have fully transitioned by thenit's not a "crazy" idea that gay couples can have biological children. likewise, most ideas aren't "crazy": people just lack the critical thinking to understand something outside the context of their own ego, this should be illegal