It’s nowhere near that complicated. Regardless of type or delivery method, a “vaccine” is a shot that prevents you from getting a certain disease, like polio or smallpox, or the often cited yellow fever.
I take the jab, I don’t get the disease.
Covid jabs do not offer this protection, nor do they claim to. Vaccinated subjects assume all the risk, from mild reactions to severe to death, and they do so for an immeasurable metric, that being less severe disease if they do happen to contract Covid.
The risk does not outweigh the reward, in spite of what professional liars tell you.