She further explains that parents tend to believe that all other children in and around their community have already been vaccinated, which allows them to assume that their child will be unlikely to contract the vaccine preventable disease. Brown stated in her article that this concept of "herd immunity can be dangerously weakened by the anti-vaccine trend" (Brown). If parents continued with further research they would find that vaccines can be easily transmitted in communities where parents believe in this concept. The more families that chose to rely on herd immunity increases the chance of vaccine preventable diseases spreading. The more children left unvaccinated allows the disease to transmit to more children. If vaccines were to become compulsory the only children that would be forced to rely on herd immunity would be those with medical illnesses that force them away from vaccines and those who are too young to receive the many different vaccines. This would help with the unnecessary deaths that occur due to children being left unvaccinated. Herd Immunity is not the only reason why parents choose to leave their children unvaccinated. .
Parents who are uneducated about vaccines are afraid of the risks that could occur due to receiving a vaccine, which leaves children who are medically incapable of receiving vaccinations at risk. In order to become educated these parents would be forced out of their comfort zone to learn true facts about vaccinations such as, "the risks of being unvaccinated are far more intense than the side effects of being vaccinated" (Salmon). That was pointed out by Daniel A. Salmon, who is an associate professor at Johns Hopkins Bloomberg School who earned his Master's Degree in Public Health at Emory University, and followed up with getting a PhD at Johns Hopkins. Salmon is now currently focusing his research on vaccine preventable diseases.