I expect it would be far more common for there to just verbal mistreatment or non-lethal violence aimed at staff interacting with the public. Another aspect would also be whatever drugs a person is on or a person not being all the way there for whatever reason. Like it's not really justifiable to be a dick just because of injury or trauma but if someone is actually mess up enough to be a patient they're probably given some drugs.
For visitors the issue is likely heighten emotions leading to poor decisions and outcomes. Same reason way domestic calls can be dangerous. That isn't a justification just a reality of how things can go.
It certainly doesn't help that many hospitals are understaffed and existing staff are burning out.