Here’s simply an observation:
Any virus that enters the human body is alien and sensed as such. It’s shape and size are immaterial – it can be up to no good and is so recognised. There is no passport which will say “This virus is free to roam where it pleases” – our bodies are naturally primed to realise their danger and to at once commence cleaning up operations.
Vaccination procedure is akin to going to a peaceful community and showing them a piece of a recently exploded terrorist bomber and saying “Hey, this is what they look like you better watch out for any coming your way” and at the same time setting off all the alarm systems in the town simultaneously, whilst carrying out some military exercise, going door to door with armed soldiers. That crazy and that irrelevant.