Stop.
The point is how can you not break down the affected population into risk categories - that's sloppy science.
You cannot compare the risk an obese 80 year-old incurs v. a healthy 40 year old.
Well, you can compare them. And each individual should weigh the risks of disease against whatever risks there are for vaccination given their personal medical history and current health situation.
But from an epidemiological standpoint, when you’re talking about risks to the population as a whole (e.g. how many casualties can we expect), you don’t need to break down by groups when you’re discussing the entire population as a whole. If the IFR (Infection Fatality Rate) for the entire population is 0.65%, and if variants have demonstrated they can largely ignore the vast majority of previous infections (P.1 has demonstrated this in Brazil), then it’s entirely appropriate to set an upper bound of population casualties by taking the IFR and multiplying it against the population total.