And they do not harm children , the rare exeptions are few, like allergy and as with penicillin allergy it doesen´t reflect on the positive net effect. Another exeption would be the rushed vaccine for swine-flu in Sweden, some children had a reaction and developed narcolepsy, it’s easy as a parent to get skeptical and rightly so. I feel deeply sorry for the families that got effected and only hope that they can see this as an isolated incident, that vaccine is nothing like the ones we all get during our childhood, they are so incredebly important and I do not wish for the scienario were a large outbreak again unite us on this question.
Steven Novella has written many exellent texts on the subject so I recommend reading, everything, but in this case Convincing Antivaxxers and maybe like me you´ll be browsing for a while longer then expected.
“Steven Novella is an academic clinical neurologist at Yale University School of Medicine. He is the president and co-founder of the New England Skeptical Society. He is the host and producer of the popular weekly science podcast, The Skeptics’ Guide to the Universe. He is also a senior fellow and Director of Science-Based Medicine at the James Randi Educational Foundation (JREF), a fellow of the Committee for Skeptical Inquiry (CSI) and a founding fellow of the Institute for Science in Medicine.”
Here you can read about the anti-vaccination movement from RationalWiki. enjoy.