And there are people who had the virus, had the vaccine, and the Delta hit them hard. Thing is we don't know a lot about the virus or vaccine, but people want to insist others do what they're told without asking questions so they can feel safe.
Nothing is guaranteed. Getting a vaccine is all about probabilities- it reduces your chances of severe illness or death. But companies, schools, etc. can require it if they want, just like individuals don’t have to get it if they don’t want to. It’s all freedom of choice.