No passle in a while because I've been away but this is an interesting article I read a couple of weeks ago.
Studies show that simply presenting facts does little to change peoples' ingrained false beliefs. In fact, perversely, if a person's misconceptions are tied up with the sort of socio-political beliefs that contribute to their sense of identity then simply presenting evidence may serve to entrench their misconceptions rather than weaken them.
The result was dramatic: a whole lot of nothing. None of the interventions worked. The first leaflet—focussed on a lack of evidence connecting vaccines and autism—seemed to reduce misperceptions about the link, but it did nothing to affect intentions to vaccinate. It even decreased intent among parents who held the most negative attitudes toward vaccines, a phenomenon known as the backfire effect. The other two interventions fared even worse: the images of sick children increased the belief that vaccines cause autism, while the dramatic narrative somehow managed to increase beliefs about the dangers of vaccines.