'doctors and nurses ...are quite as cable to judge and apply ethical reasoning as anyone else'
Sprietsma, you are probably right, but the difference is that doctors are the gatekeepers to prescription contraception.  And I can tell you from personal experience that the vast majority of doctors (I am one) and nurses (I dated several, and married one) simply don’t have the aptitude or the intellectual grounding to deal with this issue. 

Most doctors are like everyone else—they absorb their sense of morality from the prevailing culture.  When the culture is decadent, and modern western culture is decadent, those are the ethics they conform to.

'As to application of ethics to the ethics of their own profession, probably they are more competent than those who know little about medical matters.'
Again, contraception is not medicine.