I know someone who works in health care and who speaks Spanish relatively well. Many of her patients are Spanish speaking. If the patient only speaks Spanish, it is a big help if the healthcare provider can speak Spanish. The same agency where she works also has nurses who speak a wide range of other languages (Haitian Creole is one example that comes to mind), because that is what some of their patients speak.
On the one hand I want health care providers who are very good at the health care aspects of what they do. I want my surgeon to be a good surgeon more than I want him to be a nice human being or to look like me. However, there is also some legitimate reasons to have health care providers who both understand the culture that they are working in, and who have language skills that fit their patients.