I don't really understand the dichotomy. Surely epidemiologists sometimes want to argue a policy point and sometimes want to attempt to be as objective as possible? It is important to be clear about what one is trying to do. Savitz is right that it is almost impossible to be objective and honest, even with oneself, never mind if one is trying to get an article into a journal, but it is still a noble goal. Conversely policies are needed and epidemiologists are very well placed to advise on them, so it would be a great loss if they did not. So I'm in favour of both!