The nursing shortage is definitely a worldwide phenomenon. In Ireland's Central Mental Hospital, the nurses have been threatening a walkout due to unsafe staffing levels. For psychiatric nurses, it is very important to have ample staff due to the potentially violent nature of their patients.
Though of course not all psychiatric patients are violent, but there still needs to be enough staff around to help in case of a potential emergency, this leads to the nurses feeling that they are unsafe and hence the threat. The situation at Central Mental Hospital arose due to an overtime ban by members of SIPTU and the Psychiatric Nurses Association. Hopefully the matter can be settled with the patients being harmed.