So lets take the misels. The effects of misels is not roketscience. Not is it a topic of lot of unknowns. Babies die of measels. It is not a high percentage. But it is literly 0% that die from the vaccine. I know this sounds crazy. But it is still a fact.
Discussion
What’s the real percentage of babies that die from the measles vaccine though? Or get encephalitis… that remains to be seen
Not really. Why would you want to let it return. It was like this all the way until the vaccines have been developed. It is not as if human would react differently now then before 200 years.