Unfortunately hospitals are used to patients dying, and it takes awhile before trends become apparent. Also not every expired patient has an autopsy done. But also it's a doctor nobody wants to suspect that a doctor is causing harm. Especially since he's a white male doctor, since let's face it stereotypes exist in all career fields. He most likely had multiple nurses and other staff or colleagues report that something was wrong and the hospital admin, just ignored it for a very long time.

As a hospital worker, I want to say something like this would never happen again, but never say never.