Exactly this. I am old enough to remember what was possibly the last large scale polio outbreak in the UK, and how terrified our parents were, I can also remember that luckily the polio vaccine, which was not at that time routinely offered, was rushed into production and distribution, and probably saved thousands of lives and countless more from devastating lifelong illness and disability.
Polio, smallpox, TB ( before they stopped making the vaccine widely available), diphtheria, all killer diseases that have largely been eliminated in the Western world because of vaccination. Smallpox is now thought to be extinct as a disease, though the virus is still held by many countries.
But because some deranged man with an issue and an agenda spouted lies about measles which have since been indisputably proved to be deliberate falsehoods we are now seeing a killer disease that can cause blindness, brain damage or death creepback into our lives.
Google images of severe measles infections. It is a sobering experience. Personally I would not want to be reliant on the herd immunity effect protecting my child, I would rather have the assurance that as a parent I had taken control of my child’s present and future health.