> Same as how a fetus will inevitably develop into an adult and be fully conscious, if nothing goes wrong.

Unless it dies in pain and suffering hours, days, months or a few years after birth due to a defect that we already know can never be cured or fixed by other means. Somehow societies that are least interested or capable in providing any aid to these traumatized families revel the most in their suffering.

That's a special case and the same argument / situation can apply to adults too. But only with extreme caution in both cases.