Thug culture's not so great, it's true. However, it's worth examining its origins.
Compare Korean immigrants who live in American ghettos--they usually end up getting out and moving up to middle- and upper-class areas after a while. This is because culturally they have a strong emphasis on family, usually starting businesses, living and working together, pooling their money until they can move somewhere else. They're coming from Korea, obviously, where that culture's been deeply ingrained in them.
Most American black people are descended from slaves--and centuries of slavery would tend to tear apart culture, tradition, etc. Once they were freed, they didn't have much less but some new music that everyone liked. And the Christian Church. But they didn't live in a social vacuum--"thug culture" is essentially a caricature of American capitalism, advertising and entertainment. Violence, sex, money are all constantly glorified in Hollywood. So when hip-hop started becoming popular, as it spoke passionately to the youth, there was a certain percentage who did a bit of this thug thing. And this excited suburban youth.
Businessmen, both people from white-collar America and ghetto entrepreneurs like Sean Combs, saw the value in this. The suburban rebel wants to A) listen to and emulate exciting musicians and B) shock and annoy their adult authority figures. The more violent, edgy, and sexual variations of rap were marketed more. And inner-city rappers, who are almost always trying to use rapping to make money rather than purely as a creative outlet, saw which way the winds were blowing and altered their style.
Ten years later this gangsta posturing was all people saw of hip-hop. Gangsta rap was HOT. It was MARKETABLE. You couldn't turn on the TV without seeing black gangsta rappers in Escalades rocking jewelry and scantily-clad women.
This media blitz formed expectations, both in the minds of black youth, and in "respectable whites" like Mr. Ragna here. And that's more or less how we got where we are today.
So is it anyone's fault? Maybe it's the fault of the record execs for pushing music glorifying violence and degrading women simply because it made the most money. Maybe not.
But that there's some history. It didn't create the problems, but it did exacerbate them. Gave nerdy white kids an image of fashion, music, etc. to associate with their fear of black people.