"How can we educate parents about the types of video games that they buy for their children?"
Popular opinion seems to be that gaming is for children and teenagers, however, increasingly, the majority of the gaming population is over 18, in part due to 1980s children being the first generation of gamers. These gamers should be allowed access to the content that the rest of the world (and especially, the US) has access to. Parents need to be better educated about the ratings system and how to set parental controls on the console or PC that their children have access to.