Vaccine and drug in general are not always safe. There are hundreds of lawsuit against pharmaceutical companies for injuries provoked by drugs. As example, Merck Pharmaceutical Company would pay $4.85 billion to settle the 60,000 personal injury lawsuits involving Vioxx. There were reportedly more than 27,000 stroke and heart attack deaths in the U.S.
Mandate vaccination is certainly against the free choice for parents to choose for their offspring whether their children should or shouldn’t be vaccinated. If the argument for commended vaccination is the fear from the spread of some diseases, parents who choose to skip vaccination have also many fears about the health of their children and do not trust drug companies.