You can then argue that it's caused by mental illness and we should be empathetic, but I've talked to multiple people who actually worked in psych wards, my mother being one of them. They know they need to take care of them and be empathetic, but boy don't they all have stories to tell that has caused them to dehumanize them to some extent, or suffer burnout as the alternative.
Don't just empathize with the mentally ill, but also the others you so easily burden with doing the actual work.