The burden of proof is on the health authorities to quantify win/win scenarios. Not fly by the seat of their pants, sometimes based on faulty/incomplete data and guesswork. 'First, do no harm'. If you are unsure, then don't do it.
You want to make an R-based argument? What is the contribution of children in the past 4 weeks? Do you have evidence that children shed more covid compared with vaccinated adults? Do you have evidence that R is a constant, will your calculations hold 6 months from now? Are you accounting for the selection effect of leaky vaccines on virus evolutionary trajectory? What is the cumulative 20 year ADE risk?
For worst case scenario, do you have a 20 year study of leaky mRNA vaccines against infectious disease in some animal population? No, we're experimenting on humans in a world's first. There have been vaccine disasters. Fortunately not in humans. Warning: NSFL https://www.pbs.org/newshour/science/tthis-chicken-vaccine-m...
It sounds like you reject the entire concept of public health. That is going to be a bit of a problem when you are engaging in a debate about public health policy.