Why Not??? There WERE Smoker vs NonSmoker retrospective studies that showed that Smokers have MUCH Higher Rates of Lung Cancer so why can’t there be a Retrospective study on Vaxxed vs Unvaxxed???
Because there’s no way to control for side factors. For example, you wrote:
“The Vaccinated children had:
1) had mothers with more education,
2) had higher socioeconomic status,
3) lived in larger homes,
4) had more toilet/sanitation access,
5) had fewer siblings,
6) had better-nourished mothers,
7) had more breastfeeding as infants”