As a doctor he does not have to perform an abortion but has an ethical obligation to refer care to patients who inquire. Same for pharmacist who does not believe in birth control, they have an ethical obligation to find service.
Nonsense, he's a pediatric neurosurgeon, he simply needs to say he doesn't know.
Moreover, I have yet to EVER see evidence of an abortion being medically necessary where the baby was still alive.
Doctors are not required to refer patients for unnecessary procedures.
If a doctor or a pharmacist is, indeed, "ethically" "obligated" to cooperate in any way whatsoever in the killing of innocent unborn children, then those professions need to be controlled by a pro-life mentality from the outside as necessary because they recognize no ethical or moral principles.
I can as easily forgive Dr. Carson's error of 1993 if he indeed repents of it as an error and a moral failing. OTOH, this is strike two following his curious view that the 2nd Amendment RTKBA does not apply in our inner cities. Even SCOTUS knows better on that. I also think that if this winnows out Dr. Carson's POTUS candidacy, that is OK. We need to start thinning the herd of candidates and we will not be thinning out Trump any time soon or until we can consolidate actual conservative support behind a candidate (Cruz, Walker?). Trump is not and never has been and never will be a trustworthy conservative.
On a moral AND ethical scale, referring a patient to an abortionist or abortion mill (with the sole exception of a clear and imminent threat to the life of the mother) or facilitating abortion prescriptions is an abomination and an atrocity and one that occurs quite unnecessarily more than a million times per year for 42 years now. That is just surgical abortions. Then there are RU-486, "morning after pills," IUDs, and chemical abortion related to certain "birth control" pills. Welcome to Margaret Sangerland and remember that Jesus Christ is coming back and is probably none too amused.
In our society, each married person is allowed to end his or her marriage by divorce. Why don't we allow anyone so inclined to hire a professional killer to dispose of an inconvenient spouse while avoiding court complications over alimony, child support, custody of children and distribution of property? And don't say (since 1973) that hiring a hitman is prohibited because of our regard for human life.
That is a morally indefensible position. Making the referral is cooperation in an intrinsically evil act.