Some people see this as the government telling girls to go out and have as much sex as they want. They can't see that this vaccine is a way to reduce a certain type of cancer.
Actually, some people see mandating a vaccine that is unneccesary as a usurpation of parental rights.
It is another salvo in the culture wars like it or not. A better way would be to provide the vaccination free and advertise it to all pediatricians in the state.
I don't feel that underage girls should be forced to be vaccinated and yes, there is cancer in my family. The parents should be able to decide until the girl is not underage. The message being sent is, "Now go out and have unprotected sex, honey.".