Mandatory vaccines would cause everyone to be vaccinated, causing many benefits, such as herd immunity, extinction of several diseases, vaccine-preventable diseases are still around and the protection of future generations. “Herd” immunity occurs when a large part of the population is immunized, so as to prevent epidemics. Not only that, but for those who can't get vaccinations because they're too old or their immune systems aren't working properly, herd immunity will protect them. “In 2005, an 18-month-old Amish girl contracted polio and passed it to four other unvaccinated children, but, as the community reached the herd immunity threshold for the disease, no polio epidemic occurred.” (Gardiner, Harris, 2005). Many diseases have been completely eradicated thanks to vaccinations. For example, smallpox no longer exists on this planet because everyone is vaccinated. Furthermore, polio is on track to be abolished. Since smallpox is extinct, it is no longer necessary to vaccinate children against the disease. Vaccinations will eliminate a disease, so vaccination is not required for that particular disease. Vaccination is still necessary for some diseases because