Come on, this isn't true. Even with delta the waning efficacy had become obvious in those countries that vaccinated early, with all time high infections in jurisdictions that were virtually completely vaccinated (e.g. Israel, Waterford). One study estimated 211 days until protection vs infection was statistically indistinguishable from someone who was not vaccinated (https://papers.ssrn.com/sol3/papers.cfm?abstract_id=3949410).

And how can you possibly speculate that a vaccine evasive mutation is the fault of the unvaccinated? While we can only guess, the evolutionary pressure is obvious: a vast number of hosts available to the first variant that can defeat the narrow immunity against the spike protein. We created a monoculture, with all the attendant risks.