I'm not the world's biggest fan of science, by any means (generally, I thnk its reach far exceeds its grasp, particularly when it comes to issues of morality and mind). However, when we're dealing with a clearly physiological -- that is, physical -- proposition, science has demonstrated time and again its (rational) superiority. So, in short, when it's a physical proposition at stake, science gets to be the expert, unless there are significant countervailing reasons.
So, things like this: http://news.bbc.co.uk/1/hi/england/5081286.stm just bug the hell out of me.
The issue, as I understand it, is that, since anti-vaccination hysteria in the UK began a few decades ago, immunizations with the MMR vaccine have gone down. Consequently, herd immunity has now been lost, and thus the conditions for a potential epidemic are in place. Of measles.
It simply makes no sense to me. Denying the proven efficacy of vaccines is tantamount to saying that science does not rule when it comes to proving physical propositions.