Health care "never events" are events that shouldn't happen, but do happen. The issue with never events is that these events are very serious. They can lead to significant disabilities or death. In most cases, never events are preventable.
Anyone who has ever gone in for a surgery knows that there are some risks associated with even the simplest of procedures. In most cases, the surgeon and other people who are in the operating room and recovery room do their best to ensure that the patient is kept safe. That doesn't mean that errors don't occur.