You think vaccines are helping your immune system fight Covid but then your immune system starts to detect what appears to be viral proteins in the cells of your own body which, since the vaccine trained your immune system to attack, your immune system then attacks what it thinks is the virus (proteins which may be found in the viruses and in your own cells as well) and that then leads to organ failure.
In other words, Injected Weaponized Cancer which triggers an autoimmune disorder gone wild.