From what I’ve read, sperm banks actually do a significant amount of screening before accepting donors. Random college kids wouldn’t have a chance. They usually want people with advanced education (typically a postgraduate degree from what I understand), along with clean physical and medical histories and genetic profiles. The better the donor profiles they carry, the higher the prices they can charge their customers. Supply and demand; you just can’t avoid it.
If the allegations prove true, then the doctor is a disgusting perverted fool whose career is over and freedom in peril. That is a horrible breach of trust and ethics.
It happened in 1978, the doc is most likely retired now.
Long ago I dated a doctor who was a sperm donor. When he was roasted after a 4 month term as Chief Resident in his specialty, one of the pictures showed a grade school class picture, boys and girls at their desks, with every child having his face. It was hilarious!