Many nursing jobs are very stressful and perhaps these nurses are underpaid given the work they do. Conversely other nursing areas are not difficult or stressful. Despite this their Union effectively does not allow differing wage levels. Clearly nurses in the most stressful areas where there is a shortage should be paid more then nursing jobs that are less stressful and where there is no shortage.
Not sure why you are jumping down my throat, are you suggesting every single nurse has as equally stressful a job as your sister ?