The sequential art format has long been used to examine social issues and to promote social standards in health and living. Sometimes this happens in the context of on-going series; sometimes "special issues on special issues" are published. Adam C sent me this great link to a site that has a collection of such special issues.
All are meant to be serious efforts at combating social ills or educating the public. Taken out of context, they can seem tongue-in-cheek and certainly more than a little lame. But, with a little respect for making an effort and an eye on history, we see that comics and graphic novels have a distinguished history of grappling with hot-button topics.