Hi Lemming, I'm not sure there is a better way. People are hugely resistent to changing their long held beliefs.
One wonders who the Internet really helps - sites like this do come up quite high on Google searches, however for every site like this, there does seem to be many, many more woo sites.
As skeptics, all we can really do is just keep pushing the information out there - people do sometimes listen and change their minds, and often it just takes a eureka moment where they see the real evidence and realise how they;ve been wrong all the time.
Sorry to hear about your friend's wife - it's something I always wonder, in how many people are really hurt by this type of thing. We all know the damage that can be theoretically done by these con artists, but it is hard to really ascertain how much physical damage is done.
No one ever said being a skeptic was easy unfortunately....