Let's analyze some cases and come to a conclusion. The virus can mutate in two ways:

1. change in the S protein
2. change in structure Let's examine case 1. The vaxes are claimed to cause the body to create antibodies to the S protein. If the delta variant did NOT mutate the S protein, then anyone with antibodies should be abe to detect the virus and fight it off. There is thus no reason get another shot just in order to combat delta. If the delta variant mutated the S protein so the body cannot recognize it, then the vaxes likely are ineffective, and there is no logical reason to demand people get vaxed to combat delta. Let's examine case 2. If the virus structure changed, then any vax has to address that new structure. However, medical authorities do not yet know the delta's structure and therefore there cannot be a vaccine against it at present. So why push getting vaccinated?