Because people are unable to conceptualize the idea of government-funded voluntary preventative campaigns, despite these showing success in the past.

This may be partially due to the many all-or-nothing crusaders who would prefer to use force in their quest for full protection of the citizen. Many people overcorrect because they fear that even voluntary programs are steps in this direction. Trust is low.

We have a long and sordid history with extreme and failed prevention (prohibition, the Mann Act, war on drugs).