Pharmacists, like doctors and all other human beings, have an obligation not to injure or kill people.
It is not a pharmacist's professional obligation as a pharmacist to dispense abortifacients.
Is it not a pharmacists job to fill and dispense prescriptions given to their customers by their doctors?
If a pharmacists employer allows them to refuse to fill certain prescriptions because it violates their religious beliefs, that is fine. No problem. But if the pharmacists employer does not allow this, then the pharmacist has two choices. Fill the prescriptions or quit.
And in this case as it has been noted several times, it is not Walgreens that makes them fill the prescriptions, it is state law. So the pharmacists have 3 options. Fill the prescriptions, quit, or get the law changed.
I had to scroll down to your post before I found the obvious point that everyone else seems to have missed.
Pharmacists are health care workers. Even if they don't take the Hippocratic Oath, they are obliged to use their best judgment for the good of their customers. If they think that a drug is dangerous, they have a duty to say so.
A pharmacist is not just a flunky or a clerk. I wouldn't want to deal with a pharmacy where I felt I couldn't trust the pharmacists, because someone was standing behind them with what John Milton calls "an overseeing fist," forcing them to act against their better judgment.
I wouldn't quit a pharmacy because the pharmacist warned me that a drug was dangerous. I would be glad that he gave me is informed opinion.