You seem to have fundamental misunderstandings of how both masks and vaccines work. I recommend reviewing basic materials to avoid further embarrassment.
Mask don't stop anything, they slow it, drmatically. Why do you think medical professionals have been wearing masks for 100-years?
The vaccine doesn't guarantee immunity and viruses mutate. Any given vaccine is good only against a particular strain. And some people can't take the shot. By wearing masks, we were helping protect them a well.