Certainly, the factors related to the abuse of residents may include lack of staff knowledge, insufficient initial training, experiences with an elderly person or the approach used.
As for the situation you spoke about of a member of the nursing staff being abused, that may also happen. We also see that type of situation. Programs have been put in place in the care environments. These programs are there to support the employees and help them report cases of abuse. There is a specific model that needs to be followed. It's a different approach, but it's also what happens in reality.