birth trauma

Today most babies are born healthy as a direct result of medical advances and infection control measures. Maternal and infant mortality rates have dramatically declined because of them, which is wonderful news. So given the unpredictable scope of childbirth for mother and baby, why add a risk factor?  
A water birth video recently went viral without much mention of safety. Proponents of this fringe delivery method are solving a problem that we don't have. Human birth is an unpredictable and often traumatic journey — so why add a risk factor to an already-risky endeavor?