Good question. I don't have the relevant facts, but a comparison between Hep-B and HPV of infection rate, morbidity and mortality might provide justification for differentiating public policy between the two.
I believe all states mandate Hep-B vaccination, and only Virginia and Washington DC mandate vaccination against HPV. There must be some justification for the disparity in public policy treatment.
How about this: The Hep-B vaccine has been around for 30 years, and it's mandated use occured when people weren't nearly as scientifically and mathmatically illiterate as they are now. The HPV vaccine is new, so public policy hasn't been set, and people today are stupid enough to believe that a vaccine that could save thousands of lives a year is evil because about 0.0043 percent of people who have had it suffered serious consequences (yes, including death).