Does anyone have a pre-existing immunity/anti-bodies to Covid 19.?
No. It is a nouvelle virus.
Do people have anti bodies post vaccine?
Yes. Whilst not stopping them getting infected, the immune system is preprepared so the bodies reaction is less severe.
Has anyone died from covid 19 infection and associated side effects?
Yes. The current death rate is thought to be 22/1000 people infected.
Has anyone died from being immunised?
No. Whilst there are some reports of cerebral blood clots (with one death reported) the incidence rate is currently 1-2/1,000,000 people immunised, which is a lesser rate than would be expected in the general population.
There has been vaccine resistance to every vacination campaign ever mounted, often accompanied with extreme claims. Because the smallpox vaccine was derived from cowpox we were all going to turn into cattle - apparently.
We are living in an increasingly overcrowded world, making ever greater inroads, as a species, into heretofore pristine wilderness areas. The chance of there being a zoonotic transfer has never been higher. World trade patterns and travel availability makes the chance of infections spreading uncontrolably much greater.
If you want an actual education on the mechanics of how these thing can work, I recommend reading The Coming Plague by Laurie Garrett.