They're just looking at giving it to girls at that early age to catch them before they become sexually active. That happens at a frighteningly early age these days, and we know that the sooner a girl begins having sex and the more partners she has, the more likely she is to pick up the HPV virus that can later develop into cervical cancer. It's true that STDs aren't spread through school interaction like, say, polio or measles or whooping cough (there's not a TB vaccine yet, unfortunately, Zim), but they do tend to meet their first sexual partners through school. They're just trying to cast out an early preventative net.

Would I rather it be a personal choice than a government-mandated one? Heck yeah. But I know that there are people out there who'll object to it, just as they do on the grounds that their little darlings shouldn't hear about anything other than abstinence in sex-ed, on the grounds that it'll somehow turn them into little sex-crazed nymphos who'll go out and being screwing everything that walks. That's not the result of birth control education. It's just the fear of parents who're in denial. The sad truth is that middle-school kids are out there screwing like rabbits whether their parents agree to educating them about birth control or STD prevention or providing vaccinations or not. Same thing with allowing them to decide to take the vaccination later as an adult choice. By that time, it's usually too late to protect them. There's a lot of denial about STDs and teen sexual activity. Everyone thinks their little darlings won't get an STD--or grown women believe they won't either. But the chances are dangerously high that they will.