It will. Vaccinated people who get COVID have a lower viral load and less severe symptoms (in particular, coughing, sneezing etc) that would help spread the disease. No, it isn’t 100% but it will help, and it’ll also help stop kids from spreading COVID to more vulnerable people like their grandparents.
https://www.nature.com/articles/d41586-021-02689-y
The reality is that those grandparents are going to be exposed to the virus regardless of what their grandchildren do. Those grandparents have had plenty of time to get vaccinated themselves.
https://www.businessinsider.com/delta-variant-made-herd-immu...
1. Vaccinated people with an infection have similar viral load to unvaccinated people.
> Data from COVID-19 tests in the United States, the United Kingdom and Singapore are showing that vaccinated people who become infected with Delta SARS-CoV-2 can carry as much virus in their nose as do unvaccinated people. This means that despite the protection offered by vaccines, a proportion of vaccinated people can pass on Delta, possibly aiding its rise.
https://www.nature.com/articles/d41586-021-02187-1
2. Lightweight symptoms are good. The #1 pandemic control mechanism is self quarantine on symptom onset. Or perhaps you are one of those people that sends their kid with a running nose to school because it's slightly more convenient?
The kids vaccine is 1/3 of the dose of the adult vaccine. And the adult vaccine is known to drop down to 20% efficacy after 4 months. Kids already have an extremely high resistance to severe problems from Covid.
So what exactly is the point of vaccinating kids? It sounds like a way for Pfizer to justify vaccinating and then boosting the vaccine every 6 months for nothing.