Mental health centers are not a place where alot of nurses flock to to work. There have been several situations around my town where workers were killed or hurt by the mentally ill. Its dangerous enough in the hospital. Even if we had no nurses shortage, which I still say we have nurses, just many of them choice to not work in this field anymore, we would still have a shortage of nurses who want these jobs.
This is why I am a firm believer in lobotomies for those who have been proven to be violent.