The alternative of getting a vaccine and getting the new strain isn't not getting the new strain. The alternative is getting the new strain without the vaccine.

The alternative of getting a vaccine and getting the new strain isn't not getting the new strain. The alternative is getting the new strain without the vaccine. And, to use your phrasing, we do not know how _unvaccinated_ people will react to the new strains either. We do, however, know that the vaccines seem to offer a high degree of protection.