Vaccine hesitancy has become an unlikely scourge in recent years thanks to the spread of online disinformation. However, vaccines are a public health necessity, saving countless lives every year, and protecting those for whom vaccines aren't effective or safe through herd immunity.
Much has been made during the global COVID-19 pandemic about vaccines and herd immunity, but to be clear, there is no such thing as herd immunity without a vaccine.
Look at what happened with measles, for example. Without a vaccine, it ran rampant and people died or were terribly sickened, often left with a lifelong condition as well, such as hearing loss. When a vaccine was developed, people stopped getting sick and dying. When people stopped getting vaccinated against measles, they started getting sick and dying again.