There are people can’t produce antibody even they are vaccinated, there are people are not eligible for vaccine. as human race, we need to protect them. if you are vaccinated, you body knows how to kill virus faster so it doesn’t mutate out of control also. You can learn all these common knowledge at high school science class.
In some people’s views (@espola) those individuals should be protected by not participating in public events. Ie no vaccination passport. Sounds like discrimination based on a pre-existing health condition or religious belief to me