If relatively low-paid, relatively unprotected hospital workers are "tough" enough to deal with difficult and dangerous hospital patients without using violence, why aren't the police? Unfortunately our laws have made it too easy for police to use violence against people in difficult situations where others in the exact same situation could not or would not use violence. These laws even go so far as to protect police who use absolutely brutal violence to injure or kill individuals who really just need medical care, such as Kelly Thomas [2].
[1]: http://www.thisamericanlife.org/radio-archives/episode/579/m...
[2]: https://en.wikipedia.org/wiki/Death_of_Kelly_Thomas#Incident