Let's assume that is correct.
How do you explain the number of covid cases increasing for much of this year across the country while the number of 'vaccinated' increased as well?
And don't answer in anticipation of where I am trying to 'lead' you. Use your brain, and think for yourself.
If a shot is created to stop/slow the spread of a virus, and the number of cases for that virus increases as the number of people receiving the shot increases at the same time......what does that tell you?
Even with large numbers of people vaccinated, there are enough who are not that the virus is able to continue spreading.
The R0 rate of the Delta variant of COVID is currently estimated at around 4-6, meaning that one infected person will, on average, infect 4-6 other people. By comparison, the common flu has an R0 rate of around 1.3. The severe 2009 Swine Flu had an R0 rate of around 1.6.
Using a financial analogy, the seasonal flu is a mutual fund that grows between 1.3-1.6% annually. COVID19 is a mutual fund that grows between 4-6% annually. Although the difference is initially small, it becomes significant over time.
If we round the R0 for the season flu up to 2, the first person spreads it to 2, then those 2 spread it 4 people, and so on. After 10 "generations" around 2^(10-1) should be infected. That's 512 people.
For the Delta variant, if we assume R4, after 10 generations, 4^(10-1) should be infected, or 262,144 people.
If it's R6, after ten generations, 6^(10-1), or 10,077,696.
Infections will continue to grow until we reach herd immunity. Because COVID, especially the Delta variant, is more contagious, the threshold percentage of the population needed to reach "herd immunity" is higher than the flu.
For the seasonal flu, herd immunity is reached at around 25%. For an extraordinarily virulent strain of the flu, it would be around 50%. According to McKinsey, achieving herd immunity for COVID may require
between 78-95 percent of people over 12 to be vaccinated.
This also doesn't take regional variations into consideration. The rate of vaccination is not evenly distributed. Areas that have lower vaccination rates will continue to suffer more infections and act as corridors for the virus to spread to other areas.