It's not junk. If you don't think pop culture - movies, music, television - don't effect easily impressionable young minds then I'm not sure where you've been. I'm a mentor to a young man for a program that tries to make promising students into college students by the time they're juniors. Every single person in the programs says that music, especially rap & hip hop, portrays negative light on black culture.
To even further debase your claim, most of Europe gets their impressions on American culture by Hollywood movies and the main stream media.