This was a random attack.
You should see the number of assaults on the frail elderly that take place in Nursing Homes by their “caretakers.”
Yes, it happens. Be careful of your elderly relatives. You cannot be careful enough of their care.
I worked in building maintenance and as a rule I refused to go into rooms especially at night unescorted and then only in a have too case. Most things could wait till morning.
That being said I do know of one nursing home cover up with a bad outcome. It happened amny years ago before the abuse laws as such started. The RN opened a door a patient was standing near and injured a patients head. The family was not notified and a relative who worked there found out via a friend telling her.