Messenger RNA (mRNA) vaccine. This type of vaccine uses genetically engineered mRNA to give your cells instructions for how to make the Spike protein found on the surface of the COVID-19 virus. After vaccination, your muscle cells begin making the Spike protein pieces and displaying them on cell surfaces.

Why would anyone want an injection of something that makes the body manufacture any part of the coronavirus especially the spike protein which is the most damaging part.

The spike proteins unlock the cell allowing the coronavirus to enter the cell thus infecting the cell?