The Vaccine does not kill virus, a person can still carry the virus but will not die from it only pass it on.
You do know that even with delta, the vaccine prevents the majority of infections and significantly reduces secondary transmission in the minority who do get infected, right?
The vaccine is probably the biggest factor we currently have in suppressing transmission. It’s why the demographic profile of this wave is so different from previous.
There’s no evidence that masks don’t also help. While we’re in a high transmission/high prevalence phase why wouldn’t we want to include something so simple?