From my experience in psych nursing, there is nearly the same risk in med-surg or emergency nursing. Where I did my placement, in an acute inpatient unit, we all carried around portably alarms that meant if you were ever threatened you just press it and 10 nurses and security come. I have worked in disability support and have been assaulted way more in that, then the people I know doing psych nursing. It's true that you need to be sensible with things like never letting a consumer between you and the door, but it can be enjoyable and rewarding.