I think that vaccines can be a very good thing. I also think there are a lot of risks involved. Many people have reported serious adverse reactions to various vaccines. There are also fears about vaccines being used to force sterilization (which has happened in a few places around the world)... which considering the amount of eugenics proponents in high places is a little disconcerting. Heck, the US government infected people with diseases just to study them at Tuskeegee. Combine this with the really corrupt nature of the pharmaceutical industry on the whole, and there's fair justification for being cautious.