Also why do those that had the virus and now have antibodies need to be vaccinated
No evidence that acquired immunity has staying power. Also, as with teenagers, the point of the vax is to protect others from your transmission of what may be for you an asymptomatic infection of a still more easily transmitted variation.
The concept of protecting others is foreign to you because public health measures smack as, I guess, from listening to GOP as-clowns, akin to communism or nazism.
I was going to suggest using your f'ing head before posting, then I remembered what a flawed instrument you have to work with.