There is a reason that the first nobel prize in physiology or medicine was awarded to the discoverer of a vaccine against diphtheria. We vaccinate against diseases that are life-threatening, highly infectious, and generally are a threat to society. Recent outbreaks of preventable diseases (ie. measles) due to people not vaccinating is a huge insult to the many scientists who toiled to discover what causes these diseases, and how to prevent them. Imagine what the people who died or had loved ones die of these diseases would say to people who fail to vaccinate against them.
“Measles is a highly contagious disease that causes fever, runny nose, reduced appetite and rash. It can cause severe illness and death in some people, and is easily preventable through vaccination.”