your assertion that "You cannot get herd immunity with this drug, it does not stop you from getting or transmitting the virus, it gives some protection from severe disease for a short time.". is blatantly false. the mRNA vaccine is far more effective than the old attenuated (weakened or killed virus), which often caused disease.
the AstraZeneca vaccine:- "Viral vector vaccines use a modified version of one virus as a vector to deliver to a cell a nucleic acid coding for an antigen for another infectious agent. Viral vector vaccines do not cause infection with either the virus used as the vector, or the source of the antigen. The genetic material it delivers does not integrate into a person's genome.[1]Viral vector vaccines enable antigen expression within cells and induce a robust cytotoxic T cell response, unlike subunit vaccines which only confer humoral immunity. Most viral vectors are designed to be incapable of replication because the necessary genes are removed.[2]" https://en.wikipedia.org/wiki/Viral_vector_vaccine
