Some people will have you believe that some vaccines can cause health problems.
Some people will tell you that the combined Measles, Mumps and Rubella (MMR) vaccine in particular is to blame for the apparent increase in the number of Autism diagnoses in the last two decades, with little regard for the fact that after 15 years of searching, no link has ever been found. They may fail to mention that the original study was carried out with no control group, studied a population of 12, pre-selected individuals who were known to have neurological problems and that even with all of this bad study design he still had to fake the results or that the man who carried out the study, did so at the behest of lawyers who were seeking a crank to back up their a priori assumption that vaccines caused their clients' developmental problems. They commonly also fail to mention that 9 months before he published his research, the researcher, Andrew Wakefield, applied for a string of patents for medical products that could only be commercially succesful if the MMR vaccine was shown to be not-safe. Andrew Wakefield is now living in America and charging parents of autistic children a lot of money to give them unproven and in some cases dangerous quack treatments to 'cure' them.
Some will tell you that vaccines are a moral issue, and that refusing to vaccinate your daughter against a virus that is the cause of 90% of all cases of cervical cancer is a good and moral act. They will tell you it is a good thing to leave your daughter at risk of HPV infection because she shouldn't be having sex anyway and playing russian roulette with her life makes you a good person.
With these people in mind, I present the following images:
Polio
Smallpox