hip hop? no. ganster rap music would be more appropriate.
hip hop or ganster rap is not THE genre of today's youth unless you only associate with like minded people. in previous geneartions you could point to specific type of music to that era and youth in it. grunge music defined a generation, rock n roll, big band to name a few. but with current generations you can't point to one specific genre and say it is a representation of the youth. too many youth listen to many genres. if the airwaves that played todays hit music (t.v. and radio) was just rap music then you could say that. but they don't. it is a big mix of pop music like miley cyrus, rock music, and rap. look at how many punk/emo/rock bands have been very popular if not more popular than most rappers when it comes to mainstream music. the killers, white stripes, and so many others i can't think of at the moment. young people of current generations that do not like rap music are not few and far between.
also on the comment about teaching philosophy in schools...lol. from my own experience taking basic philisophy classes in college most people in the class find it hard to follow or don't understand the material. i could understand making it an elective course in high school or a course for more advanced students but more than likely if it were part of the regular course work you would have many students receive poor grades.
there is no one area you can point the blame to why youth are getting worse. media they consume? bad parenting? no good role models in their life? lack of strong father figure? typical teenage rebelion against authority (it's almost a right of passage)? you could create a laundry list a reason but they will differ from person to person.