In the beginning, I was adament about not taking the vaccine because I was healthy and didn't feel that I needed it. What one person was worried about was complications and believed that some people were having life-threatening reactions to the vaccine that the media wasn't reporting.
A recent poll found that one in four Americans said they would refuse a coronavirus vaccine outright if offered. Some researchers are increasingly worried that this reticence will be enough to prevent the nation from reaching what's known as "herd immunity" (when a large part of the population of an area is immune to a specific disease). This provides indirect protection of the population of those who are not vaccinated.
Reaching high levels of vaccination would mean new outbreaks of the coronavirus would die down quickly, as opposed to growing and spreading.