Why are childhood immunizations important?

In my opinion, vaccinations and childhood vaccinations are probably the single greatest achievement of modern medicine. They’re important because kids used to die or ended up paralyzed from these diseases that are now entirely preventable. Why we don’t see them anymore is because people are getting vaccinated. Why we start hearing reports of them coming back is generally in populations that are not getting vaccinated. I consider it a civic duty, even a moral duty, to take care of your kids, get them vaccinated, prevent the diseases, even if it’s a disease that you might not get, but could carry, you’re exposing other people to diseases that might be very serious in the elderly, like flu vaccine, for instance. Certainly the days where the hospitals were full every summer from polio are gone, simply because of the vaccines. They are easy. They are not dangerous and I don’t want to see a return of preventable childhood diseases.