It will never be short of amazing the idea that the mRNA used to create spike protein would create a longer lasting effect than the little machine designed to infect cells to not only create spike proteins but also replicate the little machine of which the spike protein is a functional part, lyse the cell, and infect other cells. The cherry on top is that viruses do "shed!" It's like being in the Sahara at night and worrying that a tractor is going to run you over. Not only is the tractor probably not going to be a tool used against you, nature has plenty of ways to rip you to shreds.

It's like if I wanted to harm you with a covid vaccine, I would simply put covid in it.