Your ignorance is a disease and the world is worse off when you speak.

It didn't stop the spread but there have been several studies showing that it reduces spread. This logic of "if the vaccine doesn't 100% eliminate the disease it isn't worth anything" is characteristic of antivax thinking, but the vaccines have been proven to reduce infection rates, disease severity and the risk of long COVID, and cumulatively this improves outcomes for many people around the world.