Have you ever googled pictures of children with measles? Do you understand that the mortality rate in the UK is low precisely because we have a history of vaccination take up? Have you wondered why parents in third world countries will move heaven and earth to get their babies vaccinated, and what happens to those babies when they aren’t vaccinated?
Have you ever researched the way killer diseases like smallpox ( eradicated) and polio ( close to eradication) have been largely conquered by vaccination?
I am old enough to remember a huge polio outbreak in the fifties, people were terrified, fortunately the polio vaccine was widely available, I remember people queuing up outside vaccination centres, many people, especially children, died, or were left disabled.
My great uncle died of TB, another illness that is largely absent from the UK. Again eradicated by vaccination.
There used to be entire hospitals dedicated to treating diseases like TB and polio, and many other infectious diseases involved patients being admitted to isolation wards to stop infection within their community.