"natural immunity provides decent protection" is a falsehood that exposes your intentionally limited definitions of "decent" and "protection." Again it is anything but decent behavior to expose your community to a contagious virus and it doesn't protect the person desiring immunity via infection from potential disability. Natural is even in question as the mechanism by which the body produces antibodies against the virus is the same. The RNA vaccine encodes a specific antigen, this antigen is presented to your natural immune system and it produces defenses like it would to any other antigen.