When someone gets covid they have those spike proteins generated by the virus in their systems. The "vaccine" just increases that.

Remember that covid-19 is a biological weapon. The spike proteins in it are the most dangerous part, and the vaccines and the virus make your cells manufacture them. The vaccine is just worse because it has a much more sudden onset of production of the spike proteins and it is amped up.

Fundamentally the vaccine is like the actual infection, just amped way up.