There is also the problem of having a sense of security when there is a large vaccinated population which causes the vaccinated population to resume a regular life. Those who are not vaccinated are now exposed to more people in general.

Example, my wife and I prior to being fully vaccinated interacted with less than 10 people in the 1.5 years. We had everything delivered and had someone do our Costco shopping and drop it off at our doorstep. With us both fully vaccinated we go to Costco for our groceries and indirectly come in contact with probably 50 people in a single visit.