So a graph is everything? Again, variants - if you have new variants coming in, a variant that is more infectious than the last one, then it is likely everyone has a chance of getting it, vaccinated or not (again, the original vaccine was against another variant).,
To restate that very clear fact, if most of the population is vaccinated against the first variant, guess who is going to be most represented in infections of the new variant?
Again, vaccines massively reduce the chances of getting serious health complications or death. You don't get the whole picture from a graph, and you clearly don't understand how vaccines work.