Look up / google "Antibody Dependent Enhancement" (ADE) related to mRNA vaccines. In previous attempts at a covid mRNA vaccine (2012 and 2016), challenge testing the lab animals revealed ADE in 100% of the test subjects. 100%!!! Accordingly, they did not proceed further with human trials.Lets program your body's own cells to create the signature protein of a virus (foreign invader) so that your body's own immune system attacks and destroys your body's own cells
ADE is basically what you described in the bolded part of your comment above.
For the covid 19 vaccines, they SKIPPED the challenge testing phase in lab animals. This is documented fact, not a "conspiracy theory."