I suppose we could put hospitals on the list of undesirable institutions because they too attract sick people.
Hospitals attempt to cure sick people with their own techniques (drugs, surgery, radiations, etc.)
However some patients don't get cured because they insist on clinging to their dangerous lifestyles : overeating, smoking, excess drinking, crack, whatever. So, should some nay-sayers blame hospitals for the problems of their patients? Maybe for a lack of counseling, or education, or insufficient followup, but not for the fact the the hospital can cure certain types of cooperative patients.
MD