> The percentage of people that die from measles is extremely low

Only because most of the children are vaccinated!

https://en.wikipedia.org/wiki/Measles

"It causes the most vaccine-preventable deaths of any disease."

"In 1980, the disease was estimated to have caused 2.6 million deaths per year."

It would be an unbelievably cruel experiment, but if "anti-vaxxers" would win in the US and force it on everybody, in about, let's say, a decade there would been enough children deaths (it's 2 from every 1000 infected!) to prove them wrong.

As long as the most of children are vaccinated, it's the vaccinated ones who protect those of "anti."