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Parents wanted children to get chickenpox yes. They even held chicken pox parties!
Measles? No. No one is that stupid. I've never ever heard a parent actually wanting a child to catch measles in the same way.
Only the ignorant would put chickenpox and measles in the same category.
In my humble opinion.
By the way, some here will be pleased to note that Cochrane says this about the MMR vaccine:
"Based on the evidence provided by three cohort studies (3104 participants), vaccination with one dose of MMR vaccine is at least 95% effective in preventing clinical measles among preschool children; in schoolchildren and adolescents at least one dose of MMR vaccine was 98% effective in preventing laboratory‐confirmed measles cases; one or two MMR doses were respectively 92% and 95% effective in preventing secondary measles cases. "
We'd already established that ages ago. It was you denying its validity. Do try to keep up.