“Also measles is not often fatal. I personally survived it. No fun for sure.”
OK, but,
“For example, in the United States, from 1953 to 1962, on average there were 530,217 confirmed cases and 440 deaths, a case fatality rate of 1 in 1,205 cases.”
440 annual deaths isn’t insignificant for an utterly preventable disease.
And the 530,000 cases are the ones reported and confirmed. I can guarantee you that all the cases in my small town when it was going around were not reported in the 1960s.
So there are probably 10 times that number of actual infections.