Because the distribution of deaths varies tremendously by age.
According to the Harvard Med School MD who was advising the CDC on the jabs (till he got thrown off the committee for wanting to *continue* the JNJ jabs!)...
The risk of people under 20 dying from the coof is 1/3000 that of a person over 70.
People over 70 have a 5% risk of death from coof (and that with comorbidites like obesity / diabetes)...
So the risk of an under-20-year-old is 5/3000 = 1/60% of 1%, or one in every 6000 people infected.
This same doctor said nobody under 70 should get the jab, due to the combination of
a) higher risk of clotting complications from the jab
b) lower risk of dying from coof.
The risk from the vaccine is still miniscule, although I think it's somewhat nonsensical to give it to people under thirty and especially children.
The main problem is that the authorities pushing the vaccine have lied about the danger of COVID, the lockdowns, masks: just about any COVID-related topic has been full of inaccuracies and falsehoods. That has destroyed any trust in what they say about the vaccines, although in this case claims of a low risk seem justified.
I would also add that the Pfizer/Moderna lipid encased mRNA vaccines seem safer than the modified adenovirus J&J and AstraZeneca vaccines. A recent German study claims evidence that in some cases the adenovirus, instead of triggering mRNA changes in the the cells, combines with cell nuclei causing the cells to pump out a torrent of spike proteins into the bloodstream. These latch onto arterial and venous walls which are then attacked by the immune system, and the latter causes clots. Again-- in a very small number of cases. The virus itself is known to cause similar effects in some people.