I'm sure this has been done before a million times.
A friend of mine who has gone all woo recently isn't vaccinating her dd because some quack gave a lecture on the evils of vaccinating. My ex boyfriends mum was a complete quack/chrystal healer and begged me not to vaccinate against typhoid, encaphalitus, rabies etc when I went to the third world. She gave me a homeopathic kit. Needless to say I got the jabs anyway.
I think that the ''evidence'' not to vaccinate is coming from the woo crew and is fuelled by paranoid conspiracy theories concerning the pharmeceutical industry. I am not completely convinced by the industry myself but I'd rather take a chance on them than my dd getting polio etc.
I just read the MIL thread but I have been meaning to discuss this for ages.