The clinical trials for Pfizer and Moderna were testing for severe outcomes, not transmission. The vaccines got emergency use authorization based on that.

Some non-clinical studies suggested a drop in transmission (e.g. CDC study in spring 2021 which examined healthcare workers who got the jab early and were tested weekly), but it's clear now they were just picking up a transient effect, months long but wearing off thereafter.

So the mRNA vaccines are doing exactly what they were trialled to do 1.5 years ago. What your local politicians and public health authorities misunderstood from that is their problem.