Bremen, Germany had something like this....85-percent vaccinated and a incidence rate around 113 (back first week of Oct).
What some suggest (no science to this) is that people locally felt they were protected and went to normal socializing (consuming beer, dancing, meeting-up with buddies, etc). Waterford is a town of 53,000 and I might make the same assumption that locals were ready to party in a normal situation.
And if the vax protected them, that is exactly what they should have done.
No science here either, but my family and church circle never really stopped doing those things. We all got Covid...some worse than others. None of us is vaccinated. There has been no sign of further illness.