What the heck is a higher ceiling of deadliness?....
Vaccination is proven to be helpful. It is the best defence we collectively have against the virus, if we are to conduct normal life once more with the least possible human casualties. This is why there are vaccine mandates globally.
This is not deniable.
It is the same of other viruses which we have successfully eradicated or significantly mitigated (Tuberculosis, Polio, Measles, etc.).
We must do the same here to have the same rates of success.