You say that you were approached by a woman who told you her daughter became mentally retarded after getting the Gardasil vaccine.
So? My daughter graduated summa cum laude and was accepted into Phi Beta Kappa shortly after getting the same vaccine.
I'd try to explain why some thing one person told you with no evidence of cause and effect is not a reason to scare parents shitless about something that can protect their kids. But either you already know that and are using this for political gain, or you are incapable of understanding.