Keeping your kids home when they are sick and not sending them to school is not good enough. You certainly took you kids to public events - I remember seeing them at a number of juggling festivals - and most carriers of polio do not show any symptoms.

Down below someone mentioned the decline in mental retardation. "The first 20 years of licensed measles vaccination in the U.S. prevented an estimated 52 million cases of the disease, 17,400 cases of mental retardation, and 5,200 deaths." - Wikipedia. Do you really want measles back again?