> the US vaccination system is about the worst when it comes to preventing spread You have to take a few factors into account when deciding if preventing the s

> the US vaccination system is about the worst when it comes to preventing spread You have to take a few factors into account when deciding if preventing the spread is your objective. Given the staggering number of cases already out there, the time it takes to vaccinate so many people, and the number of people not willing to be vaccinated, your preferred strategy would be slow (if it worked at all, due to some people refusing to be vaccinated). In addition, people in the high-risk groups are not fully isolated. Some work, some walk around without masks, some travel. People tend to cluster in age groups, so if one person in the 65+ group gets it, they're going to interact with others in that age group. If a college student gets it, the probability of sustained interaction with someone over 65 is much lower.