Generally, programs don't want residents to be injured even if they aren't pregnant, so I would expect that most programs are already doing their best to protect residents. However, I'm sure there are variations in how many volatile patients various psych programs see, and different rotation sites can have different feels to them in terms of the level of patient acuity and level of awareness of safety. In some ways seeing the more acute/volatile patients as a resident may be a good thing - better to learn how to handle aggressive or volatile patients as a resident than as an attending. If you're very concerned, it might be worthwhile to ask the residents at interviews how they feel about the safety precautions at their different rotation sites and see what kind of feel you get for things on tours.
There is a lot of literature about the risk of violence among psychiatric patients. Take a look at what the literature says about the relative risks from different diagnoses if this is an issue that really concerns you.
Personally, I don't find psychotic patients to necessarily be scary. I have met some very pleasant and friendly patients who were also extremely psychotic. Personally, the only diagnosis I have found to be highly correlated with my feeling uncomfortable with patients has been antisocial personality disorder.