If you are of a scientific bent you may find this article to read.
Opinion of the Scientific Panel on Biological Hazards on the request
from the Commission related to the effects of Nitrites/Nitrates on the
Microbiological Safety of Meat Products. Found at http://www.efsa.europa.eu/sites/default ... nts/14.pdf
Note: This is the opinion of the panel and not an EU directive.
It won't settle the issue but it shows how complex it is. When all is said and done, its not worth losing sleep over.