The policy of "teach abstinence" fails people much more so than vaccinating against a single vector.
While a vaccine might not be a license to _____, it also fails to address education, personal responsibility, etc. Sure there are health benefits but if everyone gets a trophy so to speak when and how will the lack of learning Y manifest itself later?
That is, give the vaccine. Sure. But don't be so naive to think that education in some form isn't still necessary.
Furthermore, Mother Nature is clever and crafty. It's only a matter of time, now that protection is less necessary, before she comes up with something new.
I'm not a Luddite. But there are two sides to every advance, and we almost always igrore the unintended consequences until it's too late.