I mean P-Town was an ideal case for COVID spread, and the vaccines worked like you would want them to by preventing severe cases and essentially letting that outbreak fizzle out after the initial case load.
In the UK I see reporting that 60% of cases were unvaccinated, but the remaining 40% many of them had only one shot (because they prioritized more partial vaccinations) which we know reduces vaccine efficacy.
I'm also not sure what data there is that vaccinated people are spreading delta at a "fairly high rate". I think data is mixed at best on that right now. I think it's fairly intuitive that a symptomatic vaccinated person could spread COVID, but there are still questions about how long they are contagious and how efficient they are at spreading it. There are likely more breakthrough infections than we think going on, but it's wild to believe that vaccinated individuals are driving even an equal amount of cases right now.