Very common, sadly. Happens not just in psychiatric institutions. I was once a care worker during my university years, and some of the shit I saw makes me 100% certain I don't want to go into a care home. I was there to help... and got fired for reporting (and chewing out) a member of staff who, through their negligence and lack of care, broke a poor old man's leg. He had dementia and didn't know what was going on.